The fiancé of a fireman asks Lilly to help prove that a convicted felon, about to be paroled on an unrelated crime, is responsible for the murder of the fireman's first wife. The young mother was killed by a homemade bomb shortly before she was to testify in court against a man who exposed himself to her.

A serial rapist sends a letter to the squad announcing his return to Philadelphia after five years and his plan to strike again. Lilly's best hope of catching the rapist comes from a victim who is able to provide a composite sketch.

Lilly re-investigates the case of a murdered church organist, when his Alzheimer's-stricken widow begins having flashbacks of the night in question.

After a drug addict brings in an audio tape she found on which a fatal shooting is heard, Lilly reopens a 1973 murder case involving the death of a twenty-one-year-old rookie cop. The young officer was shot three times in the chest while responding to a call at a drug-infested housing project.

A petty crook, Ricky, 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, was found shot, and her boyfriend Al Clarkson was originally imprisoned for the crime.

Lilly investigates the case of Daniel Holtz, a college baseball player who was found beaten to death in an alley behind a gay bar in 1964. Daniel's mother comes to Lilly in the hopes that his killer can be brought to justice before she dies. Lilly discovers the maltreatment gay victims received in the 60's, when her investigation discloses that it may have been a policeman's nightstick that made the lethal blows.

When a young woman, Rosie, wakes up from a coma, Lilly re-opens the fall in which her 6-year-old daughter Toya died. Things get complicated when the mother remembers very little of that night, and Lilly feels especially motivated to find the killer.

Lilly gets an anonymous phone call from a man claiming he killed an elderly woman back in 1989 and buried her body in the basement of a house. When Lilly checks the dwelling, a body is recovered, but the alleged murderer refuses to identify himself.

Rush and Valens investigate the case of a cold-blooded killer who shot a young man trying to hitchhike his way home to Philly from Atlanta.