Christopher Gerald Williams was ten when he was taken from the bedroom he shared with his seven-year-old brother Joey in 1977. Twenty years later when another body is found, Tony realises that David Sawyer was killed in a way very similar to young Christopher, and Ali joins forces with Iredell to uncover the killer. After doing DNA tests, the squad realises that the same man killed both boys, and they begin investigating Victor de Jarre and Jacob Knewling, who were suspects in the first investigation. Ali tries to get what she can out of Christopher's now-grown brother Joey, who has become an alcoholic.

Twelve years ago, a teenaged girl named Janine Elston was shot while she slept in her bed. Her father, a former cop, goes to Cold Squad to ask for help when Wayne Corby, the man who was believed to have killed her, is about to be released from jail. Since Corby was never charged with Janine's death, he could still be held responsible.

The Cold Squad uncovers a link between the gruesome murder and decapitation of two nurses committed more than 20 years ago. (source: http://www.coldsquad.com)

In 1995, Barbara Taggert was found burned to death in her home, and her six-year-old daughter Lisa was missing. Her husband Spencer was their prime suspect, but his business partner had given him an airtight alibi. When Bill Harris rescinds his alibi to try and get off on fraud charges, the squad re-opens the investigation into Barbara's death.

Tony and Ali investigate Theresa Sandiman, a prostitute Tony has long thought responsible for a murder.

After Sandy Kilkenny is arrested for tossing a pool cue at her husband's head, the squad brings her in hoping that they can finally put to rest the murder of Rita Brice eight years ago. Unfortunately, even though Ali goes undercover in a cell with Sandy, she refuses to implicate her husband, even though everyone tries to tell her that Neil Brice is no good.

The Cold Squad begins an investigation after a homicide victim's gun is traced to a 15-year-old unsolved double murder in Chinatown. (source: http://www.coldsquad.com)

Four years earlier, Rikki Stanfield lied to Ali about what she remembered the night that she and her best friend, Michelle Dorn, were attacked to get Ali to leave her alone. When Rikki starts to remember what really happened she begs Ali to re-open the case, and despite Logozzo's feeling that Rikki is a few bricks short of a load, Ali takes on the case.

Ali and Logozzo investigate the case of Stephanie Jordan, a debutante who disappeared four years earlier and was presumed, but never proven, to be dead. Her husband, reporter Turner Jordan, is their prime suspect, and he puts a serious crick in the investigation by making a televised plea for anyone with information to phone the police. Logozzo is frustrated because his daughter from his first marriage is not only getting married outdoors, she has invited his third ex-wife Vivian, with whom Logozzo does not get along.

During a routine traffic stop, an officer arrests a shop-lifting suspect named Amanda Millerd. After she is taken to the station and booked, Ali and Jill realise that her fingerprints match those of Holly Tarrow, a prostitute believed to have burned to death on September 6, 1982. Although initially Holly maintains her identity as Amanda and claims she's in the city with her husband Grant and son Ethan, she soon admits that she is Holly, and that while at a party with her then-boyfriend Wesley Belmont, Amanda was accidentally killed by the owner of the house.