A skull and a computer-generated image lead the squad to the parents of a 14-year-old rape victim.

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.

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)

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.

As an investigation into a 20-year-old killing spree continues, the Cold Squad is rocked by murder and internal strife.

Harper struggles to build a case against a murder suspect, after an investigation that lasted 18 month long.

The squad discovers what happened with Billy Wells and Michelle Ripley.

Ali and Len re-open the case of a corrupt stockbroker, Jack Dolan, who had stolen millions from his clients. When they begin questioning the clients, they learn that Jack and his then-wife Arlene were members of a club of swingers. Originally they look at jealousy as a motive, but no one seems to have been angry about any of the relationships. Len also finds himself interested in the lifestyle of a swinger, which Wanda shoots down immediately. Nicco is finally finished his counselling sessions with Leanne, and when she calls him to her home he goes over and spends the night. The next day Leanne starts talking about their 'relationship', and when Nicco tells her she's moving too fast she accuses him of using her for a one-night stand.

Frank and Nicco are stripped of their badges over the drug probe.

Nicco is finally back on general duty, and his first major investigation involves a missing girl named Mimi whose mother has been searching for her. Ali continues to meet roadblocks in her quest to learn who truly killed Khallid Fulani, and makes a decision that will change her life. Len is determined to find Sonia's killer no matter what, and finally tells Wanda the truth about the affair.

Courts rule evidence in a murder case inadmissible prior to a retrial.

A cold case turns warm when a mysterious man collapses near a hospital.

When Ali's testimony results in the release of a killer (Dean Bulmer), Coscorella takes it too seriously and makes catching Bulmer his sole goal, much to the displeasure of homicide detective Len Harper. Nicco is furious with Ali and believes she should have lied to keep Bulmer in jail, and tries desperately to keep the father of one of the victims from taking justice into his own hands. Cold squad is in danger of being closed down, and the officers absorbed into the homicide division.

Thirteen-year-old Kevin Lane disappeared on June 6, 1979. Years later, his parents discovered that his former baseball coach Harry Walters was really pederast Martin Woodridge, his mother became convinced that Woodridge murdered her son and hid the body. Woodridge insists that he is all about consenting actions between adults and young adults, insisting that he has never forced anyone to do anything they didn't want to. After the Lanes offer a $100,000 reward for information, Woodridge comes forward and points the finger at himself. Although Ali would love to lock him up and throw away the key, she just can't do it.

The squad gets involved in the world of street racing.

Mickey and Ali investigate a twelve-year old murder that was believed solved thanks to a tip from a junkie named Simon. Coscarella investigates when two dogs trained by the same man attack people on command. Christine cannot resist the lure of her past, and steals cocaine from the lock-up.

Police corruption may have played a role in drug-gang activities.

Frank investigates the death of a forgotten war hero. Ali applies to become a Big Sister after questioning her value as a cop

A self-help lecturer may have influenced a prison guard to murder a prisoner.

Cold Squad is convinced they have the necessary ammo to bring down killer Dean Bulmer, and Nicco goes so far as to promise the family of one of his unlucky victims that it's in the bag, but when a body found proves to belong to the man Bulmer is on trial for killing, the Squad realises that Bulmer has been fingered for the wrong murder, and it comes down to the moral question of whether to lie to keep a vicious killer in prison, or to tell the truth and have him set free.

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)

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