Plot

Jane and Davey are faced with a puzzle when it appears that a local teenager has returned from the dead.

Peter and Molly Walker are astounded when their teenage daughter Leah, presumed drowned some months earlier, reappears in Light haven. She has apparently no memory of recent events and Jane and Davey believe she has been kidnapped. However when the supposed kidnapper is found dead they are forced to look at another reason for Leah's disappearance.—don @ minifie-1

A couple stands over a grave. The woman, with a cane, places a flower. It was of their daughter Leah Walker, lost at sea, at age eighteen.

In the water, a girl appears amidst the waves. She slowly approaches the shore. Her long hair is wet and she is in a white dress.

The couple drive to their home. By the door is a sopping wet, ghostly figure in white. It is their supposedly dead daughter. She smiles at them. They are in shock.

Jane and Clint arrive at the Walkers' home. Jane hands him a newspaper, reading "Local Girl Back From The Dead." Clint says people say she is a selkie, a mythical seal who appears in human form.

A corpse came ashore a few towns up the coast six months ago, which was identified as Leah Walker, based on DNA records. This is impossible unless there is an identical twin, but Leah was an only child. Jane must determine who was buried in Leah's place.

CID are exhuming the grave and take the body to the mortuary. Jane catches Beth sneaking around the scene. Beth asks if there is in fact a body in the grave, which Clint accidentally confirms. Beth jokingly says it proves the found girl is a selkie.

Jane insists she has never declared someone dead who was still alive, and it should never happen, as her profession takes care to avoid such mistakes.

Davey is interrogating the Walkers, including Leah. Leah says while they were out on their boat, she went for a swim at 1 AM while her parents were sleeping. She loves swimming a night, which her parents knew about and warned her was dangerous. She describes floating in the water peacefully, but the water started churning, and boat was headed for her, then she blacked out. Next thing she remembers, she was here, arriving at the beach, coming home. Her parents say her memory is "resetting itself" every few hours. She remembers everything up to that incident a year ago, but nothing since until today, and keeps losing short term memory.

Her father says when they first found her, she said she'd been near the sea, and heard waves in the dark. She also has red marks around her wrists, as if she'd been bound, but doesn't feel anything.

Her father wants an apology from Davey, as the police treated them with suspicion after their daughter went missing, and it caused them additional stress over losing their daughter. They expect the police will take extra attention to find out what happened.

Jane is meeting with George, the medical examiner who is the one who identified the other body as being Leah Walker. He is apologetic. He insists that the DNA matched, and it must have been a mistake at the lab, but Jane says that is highly unlikely. He than admits he was under a lot of family stress at that time, as he and his wife were trying to conceive via IVF, and it is possible it was his oversight. He begs Jane to go easy on him in the incident report, as they're expecting their first child soon.

Jane runs into Davey, who relates what Leah told him. A dark place by the water isn't much to go on. Jane wants to look at the police's missing persons database. Jane looks over the medical report for Leah. She's been diagnosed with amnesia. She can't remember anything since the incident for more than a short period of time. Jane remarks how convenient it is. But Leah does have a skull fracture. She also is loaded with diazepam, a sedative, which can affect short term memory, which should wear off. Davey suggests the sedative, along with the restraint wounds on her wrists, indicates she was held against her will.

When Leah had disappeared, her life was in a bit of shambles, failing her exams and losing a relationship. Davey says the girl's parents aren't the most personable people. He believed they were hiding something back when he was investigating Leah's disappearance.

Leah's parents are playing back seaside sounds for Leah, but she doesn't recognize anything. She asks that they stop. They ask her to tell her if she remembers anything at all. She agrees but sounds annoyed. She then asks why her mother has a cane. Her mother was diagnosed with cancer, which she's already been told, but has forgotten. Her mother's cancer is serious. Leah worries her disappearance contributed to her mother getting ill.

Her parents thought she might have committed suicide, and alludes to something they said to her. Her father opens the door and a man enters. It's her godfather, and friend of the family, Tim Morris. She indifferently gives him a hug.

There's party coming up for Leah's reappearance, down by the marina, that Beth wants to attend.

Jane is going over the misidentified corpse's medical report. She was about the same age as Leah, drowned, had slight spinal issues. Due to being in the ground for six months, they don't have a DNA sample from it yet. But the dead girl was three inches shorter than Leah. Jane can't understand how the examiner could have missed that.

At the party for Leah, Beth and Jane are there, as is Davey. Tim Morris approaches Davey. He asks what Davey thinks happened to Leah, but he is noncommittal. He mistakes Jane and Davey as a couple. Davey is following up leads on possible kidnappers with records.

Beth runs into Leah, and introduces herself. Leah brushes her off politely. She gives off a mysterious air.

The medical examiner, George, is at the party with his expecting wife. He is hanging out with Mr. Walker and Tim Morris. Jane is surprised that he is there, considering his involvement with the mistaken identity of Leah's body.

Clint is chatting up Leah about surfing. She used to go to St. Tristan's, a fancy boarding school, which is ten miles away. Her parents weren't really into her, so sent her to boarding school to keep her out of the way. Jane walks over, and Leah politely leaves. Jane looks down at Leah walking below, and then at Tim and George chatting. Tim walks away. Jane goes down.

Tim is down by the carpark chasing Leah. He asks her if she wants everyone to laugh at her. He pleads with her to stop being a child, and he says he is sorry. She shoves him off and tells him to leave her alone. He wants to talk to her. He punches a car and leaves. Jane sees all this.

Mr. Walker comes out and grabs Davey. Leah has remembered something. She is looking at a painting, and she says she's seen it recently, but not at the party venue. She remembers a room with no windows, and an orange lamp.

The next day, Davey comes over to Jane's. He's interviewed the artist of the painting Leah identified. He's given him a list of the people who bought prints of the painting. One of them is Tim Morris.

Morris owns multiple holiday homes in Devon. One of them, "Skylight," has been taken off the market for renovations since last year. Davey is hoping Jane can pose as an interested buyer to get access to the place.

Davey and Jane check out Skylight. Davey finds a doorway to a set of stairs going down. He and Jane follow the stairs down and find a small room with a bed in it and no windows. Jane describes it as a "love nest." There is an orange lamp by the bed. Behind the door is the painting Leah remembered.

Tim Morris has gone missing since Leah's welcoming party. Clint has found a record of a French girl who went missing around the same time as Leah, who matches the description of the corpse in her grave. Jane has him get her records.

Davey takes the Walkers and Leah to the holiday home and take her to the room that Davey and Jane found. Leah is visibly unnerved. She confirms she was in the room. Walker threatens to kill Morris. The police put out a search for Morris.

Davey theorizes that Morris hit Leah with his boat, then kidnapped her. Possibly he hit her deliberately to knock her out. The effect on her memory was just a bonus. Jane points out they couldn't hear any waves from that room.

Police have found Morris' body on his boat, in the marina. He was apparently pushed and fell into the cabin, hitting his head fatally on a corner of the cabinets. He's been dead at least half a day. He was in the middle of writing a letter of apology to the Walkers. A cell phone was found near the body. It is Peter Walker's. Walker is arrested. Leah is surprised and saddened. She looks out at the water.

Davey is interrogating Walker. He left the phone in his jacket pocket at the party, and when he got his jacket back, it was missing. Davey says there's no other fingerprints on it. Walker gloats that Davey has been out to get him since last year. Walker says he went straight home after the party with his wife and daughter. Davey urges Walker to confess to killing Morris, saying most people will sympathize and he will likely get a light sentence. Walker is incredulous. It wasn't until today that he had reason to hate Morris, when they discovered the room.

Jane has found research of a reliable way to get good DNA from a decayed corpse. Mick wonders why Morris' holiday home is a crime scene if his body was found on his boat. Jane can't tell. Mick ventures a guess. The house was Morris' "love palace," where he took his womanizing flings. Mick knows a carpenter who has been doing work on that house, and they said every time they worked there, they could smell perfume, and a different one every time.

Jane arrives at the Walkers' to speak to Leah. Reporters and paparazzi are camped outside. Leah has left, taking her bicycle, leaving behind a note. It is an apology from Leah for "everything I've done to you." Mrs. Walker doesn't know what she could possibly be sorry for. She laments being a poor mother for Leah. Jane asks if something happened between her and her daughter last year. Leah came to her parents having become pregnant, and wanted to keep the child. Her parents were not pleased, after investing in her elite schooling and her failing her exams. She says they said "terrible" things to Leah.

Jane speaks to Davey. She casts doubt on Leah's story of being kept in Morris' house, based on following up Mick's lead with the carpenter. Davey still assumes Walker killed Morris and needs to find Leah, but Jane tells him she's run away. She tells him about the row the Walkers had with Leah last year.

Leah's bicycle has been found, near a cliff.

Beth is walking through town. She stops near a bridge near a historic rail line. She spies a girl in cap and sunglasses with a bag heading from the station landing. It is Leah. Leah meets another girl by the station, they chat and the girl hands Leah a passport. Beth tries to get a better look as Leah and the other girl enter a cafe. Beth calls her mother. Jane urges her to stay on them.

Beth watches Leah and the other girl in the cafe. The other girl gets a call and gets up. Leah and the girl leave and head to the marina. Beth follows them.

Jane and Davey rush down to where Beth is. Beth has spotted the girls getting on an inflatable boat. They run to the pier. Davey commandeers a water taxi and he and Jane follow the inflatable. They are headed for a party boat in the harbor. They board the boat and the pilot tells Davey where to find the girls. Davey asks Jane to go in after them.

Jane enters the room, where Leah is stocking up, and confronts her. Leah's been on this boat for a while, her things are still there. She never had any memory loss. Morris took Leah to his holiday home, Skylight, to have sex, and got her pregnant.

Leah talks to Davey and Jane. Morris told her that if she had his baby, his life would be ruined, and threatened her. When she told her parents about her pregnancy (but not about Morris), they were unhelpful. Her mother called her a "big mistake." Her father showed no interest. Leah had never felt wanted by them, but at that moment, she felt nonexistent. She thought that if they thought she was dead, they'd finally care. But she couldn't bring herself to commit suicide, especially with a child. She got a job working on the party boat.

She was able to see a video of her own funeral, which she said was terrible, and her parents unrecognizable. The emotional toll caused her to miscarry her baby. She was scared and embarrassed to return. When she saw a social media post from her father about her mother getting cancer, she planned to return. She had to come up with a story, and came up with kidnapping, wearing handcuffs every night to get the wrist marks, and taking pills. She injured her skull jumping off the boat.

Jane wonders why Leah went so far as to frame Tim. Leah explains that she and Tim only had sex once, and it was her first time. She didn't feel ready to lose her virginity, but Morris pressured / forced her into sex. Not being experienced, she thought that was normal. She later learned that it wasn't, and confronted Tim at her party, but he wasn't remorseful enough, and told her she knew what she was getting into. She threatens to go to the police, but he says they'll laugh at her. She decided then to frame him, and isn't sad that Morris was killed. Leah asks if her dad has confessed.

Jane visits the police station and looks in at Walker. She figures it's over for him. Davey shows up with some paperwork and says Walker might be okay after all.

Davey goes to see George, the medical examiner. He confronts George that he wasn't so much struggling with the failures of IVF, but rather the cost. Tim Morris, whom he knew through the marina club, knew he was struggling with money. Morris also assumed Leah killed herself, and that he was to blame. To save himself, and his friends the Walkers from grieving, he paid George to mis-identify another body as Leah so they could have closure. In return, Morris would pay for all of George's wife's IVF treatments. But with Leah alive and well, and Leah threatening to go to the police, it all threatened to unravel, so Morris planned to confess everything. At the party, George went Morris' boat to confront him about the implications for himself if Morris told all, but Morris didn't care. They struggle, and George throws Morris into the corner of his cabinets, cracking his skull. George then went back to the party, stole Walker's phone, and dumped it into the boat, to frame Walker.

George runs, but uniforms are at the door, and he is arrested.

Walker is dropped off at home and embraces his wife. Leah is back as well. She apologizes to them, but they apologize to her.

Jane got results back from the corpse's DNA, but there was no match, with any known record. Jane goes to the water to leave a bouquet in honor of whoever the body is.

The coroner's verdicts: For the death of Timothy Morris: Unlawful Killing. For the death of Unknown Female age 17-19: Open.