Lily re-investigates a 1980's murder where a young housewife was blown up by a bomb in her backyard. Meanwhile, the victim's now-grown daughter is bothering a pervert whom she believes is the killer, but is he?
When a serial rapist sends a letter to the squad announcing his return to Philadelphia after five years, the team re-investigates the 1998 murder of a college student who was believed to be one of his victims.
A petty crook, Ricky (Tim deZarn), hoping to get a reduced sentence, relates witnessing a young man washing blood out of his car the night a teen track runner was murdered. The young athlete, Paige Pratt (Summer Glau), was found shot, and her boyfriend Al Clarkson (Doug Kruse) was originally imprisoned for the crime.
After two years in a coma, a mother wakes in the hospital. Rosie hardly remembers the night she and her daughter were thrown out of a window, killing her daughter. Lily and Scotty look into the case and find a whole nest of bad secrets.
The team is searching for as suspected serial killer. The murders started with a young man who was hitchhiking home from the casino after winning $3000. They have little to go on other than a boot print.
A young college girl had been killed several years earlier and laid out in a pond. The college professor, with whom the girl was having an affair, was always suspected but there was nothing solid to go on. Another girl is killed the same way.
A 25-year-old woman was found raped and suffocated in a boarding house for "colored women" in 1939. Written off as a prostitute murdered by a john, Sadie's death made her daughter ashamed of her heritage. After her mother's death, the granddaughter asks Detective Rush to find the truth. Few contemporaries survive, and the crucial DNA evidence must be obtained from Sadie's exhumed body's fingernails.
The team investigates a 1958 case where a dead 6-year-old boy wrapped inside a box was discovered in a field. The previous investigation developed no leads in determining the identity of the boy. However, new evidence suggests he may have lived at a nearby Catholic orphanage.
Excavation of a building erected in 1969 reveals two skeletons, one black male, one white female. Remains of clothing and ID's lead to a revolutionary group during that Summer of Love. The couple were volunteers who were taking pregnant girls to receive abortions from an activist physician just before they disappeared. Rush and her team must sort out many possible suspects and motives: jealous boyfriends, racism, rumored FBI informers, and the ALF (Afrikaner Liberation Front) among others.
An up and coming basketball player on the way to making it big is found dead on a street playground. Was it a street robbery gone bad, an overly competitive player who wanted his slot or something else?
Facing federal charges induces an inside trader to broker another trade: information about a unsolved murder for a lesser charge/sentence. Though it does not pan out, it leads Rush and Valens to a tangled web of deception, drugs, stock swindles, sexual harassment, manipulation and enough suspects to keep them all busy sorting out trash from truth.
This case was from a woman's murder in 1989. The case is reopened in 2004 when the witness gets in trouble with the law and is a juvenile delinquent and arrested several times. The witness was her three-year old son on the night of his birthday. The son remembers red and yellow balloons, a train, and the name Bobby. The team investigates the case. They discover things that don't add up. Lilly attempts to drill some sense into the juvenile and brings up part of her past.
In 1986, a teenage girl was raped and stabbed to death in a popular lovers' lane. A man was arrested and convicted for the crime, based on circumstantial evidence. When the case is retried using modern DNA technology, he is proven innocent and Lilly and her team set out to find the real killer.