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David finally agrees to tell Kathryn about his relationship with Mary Margaret, as flashbacks show Charming helping Princess Abigail with a dangerous mission.

With their love for each other growing stronger, David finally agrees to tell Kathryn about his relationship with Mary Margaret and put an end to his loveless marriage. Meanwhile, in the fairytale land that was, while runaway groom Prince Charming searches for Snow White, he agrees to aid Abigail on a dangerous mission to recover something precious that was lost to her.—ABC Publicity

We open in Fairy Tale Land, where Princess Abigail greets in the king in preparation for her royal wedding. The knights race off, but the king brushes it off to Abigail and tells a knight, "Find him." We next see Prince Charming evading the knights who are chasing him. But he's soon captured by two men in purple cloaks.

In Storybrooke, Kathryn tells David she applied to law school and was accepted. It's in Boston. She thinks a fresh start is what they need, focusing on making new memories rather than chasing old ones.

Back in Fairy Tale Land, we see that the prince's captors were working for Abigail, who confronts him and tells him she knows he's in love with Snow White. She says she's come to help him escape -- because she doesn't want to marry him, either.

In Storybrooke, David goes for a walk with Mary Margaret, who thinks they have to tell Kathryn the truth about them, and everything. David isn't sure he can. Mary Margaret thinks being honest with others is the only way they can be honest with each other. She tells him, "The only way no one gets hurt here is if we don't want to be together." He says he doesn't want that, and she insists he make a choice and tells Kathryn.

"I choose you," David tells Mary Margaret. She tells him to tell Kathryn, and walks away.

Emma runs into the motorcycle guy at the diner, who asks about their date. Emma wants to know his name. He tells her it's August W. Booth, he says, clarifying that the W is for Wayne. He invites her to meet him there after work. She goes inside to meet Mary Margaret, who's curious. They get back to talking about Mary Margaret, who admits she hasn't been staying away from David. Emma has known, but didn't say so. Mary Margaret tells Emma that David is telling Kathryn everything.

We next see Kathryn and David, and he tells her he can't go to Boston with her. She asks for the truth, and whether there's something going on she doesn't know about. He says no. He says he doesn't know what it is, but there's something that's preventing him from connecting. He says she's right about needing a fresh start, but not with him.

In Fairy Tale Land, Abigail and her caravan escort the prince to her father's kingdom. Before he leaves, he wants to know what's really going on. She says her heart also belongs to another -- a man named Frederick, who she was once intended to wed. The prince says he can't help her, because his love told him she doesn't feel the same way for him as he does for her. He calls this his tragedy, but she says it isn't a tragedy. She walks him over to what appears to be a statue of Frederick. It isn't a statue, though. It's Frederick, who was turned to gold when he jumped to push King Midas to safety during a battle. In hopes of bringing Frederick back to life, she'd have to reverse the curse, and she tells the prince about Lake Nostos whose waters are said to have magical properties that can return to you something that's been lost. The prince vows to get to the lake and its water, despite the guards who surround it.

We next see August making a copy of Henry's book.

Regina gives Henry a gift -- a video game joystick. She asks him again not to be upset with him for tearing down the playground and losing his book. Henry says he wants to see Emma. Regina doesn't say anything as Kathryn shows up and interrupts them. Kathryn's crying and tells Regina about David leaving her. Regina immediately calls out Mary Margaret for being a homewrecker, and Regina breaks the news to Kathryn that Mary Margaret and David have been having an affair. Kathryn asks for proof and Regina shows her pictures Sidney had taken. Regina says she didn't say anything because she wanted Kathryn and David to work it out. Regina says she wanted that because she's Kathryn's friend, but Kathryn says a friend wouldn't lie.

In Fairy Tale Land, the prince reaches a shrine where anyone who attempts to get to the lake is meant to leave an offering. He tosses his helmet toward and heads for the lake, leaving Abigail behind.

In Storybrooke, David tells Mary Margaret that he told Kathryn, and she tells him he did the right thing. Kathryn shows up at Mary Margaret's school and slaps her in the middle of a hallway. Kathryn yells at her in the hallway while others watch. Mary Margaret is stunned to realize that David didn't actually tell Kathryn about their romance.

In Fairy Tale Land, the prince easily reaches the lake and dips a canteen in for water. Soon, he hears a rumbling and draws his sword, calling out to whomever is headed toward him to show themselves. Soon, a beautiful siren emerges from the lake and catches the prince's glance.

August gets to the diner and asks Emma to hop onto the back of his motorcycle. He drives her out to a "watering hole." It's a well. He says there's a legend about the well -- that its water is fed by a lake that has magical properties. The water from the well is said to return something lost to you. They toast and drink the water.

Mary Margaret feels everyone gossiping and whispering about her as she walks down the street. An older woman tells her she should be ashamed of herself.

In Fairy Tale Land, the siren approaches the prince and tells him she can be anyone he wants. He says he won't fall prey to her deceptions, but she raises a handful of water over herself and lets it pour over her -- turning her into Snow White. The prince tries to resist, but gives in and kisses the figure. His sword drops into the lake. The siren tries to lure him into the water, but he says he doesn't want an illusion, he wants the real thing. The siren pushes him into the water and a vine pulls him downward, trapping him under. The prince spots a knife at the bottom of the lake and when the siren returns underwater and plants another kiss on him, he stabs her in the stomach with the knife, then cuts the vine away to swim to the surface.

In Storybrooke, David is trying to clean off the word "tramp," which has been spray painted onto Mary Margaret's car. She finds him, and confronts David about why he didn't tell Kathryn about them. He says he didn't want anyone to get hurt, but she says he not only lied to Kathryn, but he also lied to her. He tells Mary Margaret they have to pick up the pieces and move on if what they have is true love, but she disagrees. She says what they have is destructive and it has to stop. She says they shouldn't be together.

Emma gets to her car and clears off some leaves. In the gutter, she finds a metal case that has Henry's book inside. August watches this from across the street.

Kathryn pays Regina a visit to apologize for her reaction. Kathryn tells Regina that David has never looked at him the way he's looking at Mary Margaret in the pictures. Kathryn says she's coming to understand she's never been in love. She says her marriage to David was "just like an illusion." She says she's going to go out there and find love. She's moving to Boston alone. Kathryn tells Regina that she told David that he and Mary Margaret should be together. Regina seems troubled by this development. Kathryn confesses she's "always had this irrational fear of leaving Storybrooke." Regina tells her she just might find what she's looking for -- but she says it in that creepy Evil Queen kind of way that makes you know she doesn't mean it.

In Fairy Tale Land, Prince Charming returns with water from the lake and gives it to Abigail, who pours the water over the golden Frederick. He comes back to life. Abigail and Frederick kiss. (Frederick is the same guy Kathryn bumped in the school hallway when she went to yell at Mary Margaret). Prince Charming heads out to find Snow White again. Abigail warns him to make haste, because King George will send his men after him. She adds, "Some people will stop at nothing to destroy the happiness of others."

We next see Regina sneaking into Kathryn and David's house, and stealing the envelope Kathryn had left for David.

Emma finds Henry playing his video game. She hands him the book. He's surprised, but thinks it's a sign that their luck is changing. She smiles and tells him she hopes he's right.

Back in Fairy Tale Land, Prince Charming is still looking for Snow White, who runs into Little Red Riding Hood. She tells him that Snow went to break up his wedding because she loves him, and that something must have changed her mind. He thinks it wasn't "something" but "someone." He looks up and sees King George and his knights heading toward them, with the king yelling for the prince's head. He sweeps Red up behind him and gallops off with her.

In Storybrooke, while Kathryn is on her way out of town, we see Regina burning the envelope Kathryn had left for David. Kathryn, meanwhile, is driving down the dark road and we next see the Storybrooke version of Frederick driving upon the scene of Kathryn's car, which has gone off the road just short of the Storybrooke town limit. He walks up to the car and sees the airbag has deployed but there is no one around. Back at Regina's place, the envelope has burned and we zoom in on her mean, evil, smug face.