Ali and Frank investigate a rock star accused of murdering a woman who fathered his child -- a woman he swears he never even met. While trying to figure out what Nicco does with his time, Mickey investigates the case of a woman who comes in and tells them her husband killed a baby.

An 18-year-old girl agrees to allow the man who raped her,Lance Rivet, to go free after the mother of a rape victim convinces her that he has information that could nail her daughter's rapist and murderer, Rivet tells them that T.J. Larper killed her and another girl but evidence reveals that Lance committed one of the murders himself. Unfortunately, they can't touch him.

While I.A. investigates Ali for shooting at a man she thought was holding a gun (it was a remote control), Mickey and Nicco do stakeout duty together looking for Kirk Lennox and get on each other's nerves. Ali pairs up with Bill while reinvestigating the murder of Clara Pritchard, while Mickey comes under fire from Nicco, who wants her to lie and support Ali's original belief that the man was holding a gun. When Nicco learns that Mickey is sleeping with Bailey Gallanson, he berates her for refusing to lie for Ali yet being willing to sleep with Gallanson, who is not only married but has young children.

Nicco has a lot of trouble dealing with the case of a teenage girl who was murdered, remembering a girl in his past that went missing. When queried by Sam, he admits that this is his first kid case. Mickey and Ali investigate an American serial killer who claims to have murdered two girls in British Columbia, believing the man is just trying to escape the death penalty. Kyle Bradley identifies one girl as his sister after shown the teddy bear pendant found by her body.

Firefighters find a mass grave in the cellar of a home with nine bodies, one of which is directly connected to a cold case. Christine has trouble fitting in when she takes over for Bernice, who didn't leave her any instructions. Mickey comes under suspicion when Bailey's wife is murdered because he pointed the finger at her.

Nicco is in the hot seat when his friend Gus (another cop) is shot and killed, and a local drug dealer, Hoppy, is charged with the murder. Ali and Mickey investigate when a thief about to be released from jail confesses to a murder, believing he simply wants to remain in jail.

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.

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.

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.