Marcey Bennett was only fourteen when she was found raped and murdered in April of 1986. The gardener, Matthew Dalton, was arrested for the crime and later confessed. While cleaning out some of the junk in Sam's office, Max finds a videotape showing the investigation and when he and Ali realise how horribly the scene was contaminated, Ali decides to take another look into the case. With the focus on a former cop turned judge, Lance Giffen, Tony accuses Ali of being out to get all cops, still not over what happened with Vince Schneider. Ross decides to let Ali take an unofficial look, but warns her about Logozzo's drinking.

It's almost Logozzo's birthday and a contact, Buzz, who shares the date, shows up with a tip for Logozzo that may help solve a cold file on a truck driver who was murdered while trying to rape a young woman. The key witness, the woman, was drunk and emotionally disturbed. Ali learns she is now married and has found religion. But she is unwilling to help. (Detailed recap available.)

Two robbery suspects take hostages in the squad room.

The murder of gay-basher Ken Reegan on Davies street prompts the squad to re-open the three-year-old murder of another gay-basher, Terrance 'Tron' McLean. Nicco and Len connect with homicide to investigate the case, and Len can't keep his personal prejudices out of the case, which involve working with a gay officer, Luke Darling. Mickey uses the department's new computer toy to help Ali with a 10-year-old arson case. It eventually leads Ali to Boris Delgado, a former troublemaker who found religion after the first fire but was unable to escape his past.

Ali and Frank are assigned to find out who murdered plastic surgeon Marvin Michaelsen after a drug dealer identifies him as the man who removed his fingerprints, but the tension between the two soon ends up taking a higher priority than the investigation. Nicco and Mickey work together on the case of Dermot Wells, a garbage collector that is believed to have murdered his former co-worker, and make a bet on how soon they'll get a confession.

Harper can't let go of his obsession with Viveca Wells. He is convinced that she murdered her last husband, and when he learns she's engaged to be married again, he tries to warn her fiancé, Richard, who tells Harper that he knows all about her past, and he's okay with it. While researching the case with Ali and trying to fight his own attraction to Wells, he learns that Richard has been the man in her life all along. Nicco is upset because in the six weeks since he's been off of suspension, he hasn't worked a single case. Ali finally throws him a bone by having him interview a prospective witness in the case of a racially motivated murder and while Nicco gets the man to ID the suspect, he's not happy with it.

A count of the corpses in storage at a police training facility leads to a murder investigation.

The squad helps Moscow police probe a Russian hockey star's death.

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.

Ali investigates the death of Philip Morris, a teen who was believed to have committed suicide by jumping off the Capilano suspension bridge six years earlier. Coscarella worries his son Leo may be gay after Frank sees him embracing another guy after returning from a rave.

mickey stumbles across a potential lead in an investigation that had been leading the squad to a dead end in there investigation.

Nicco and Ali investigate the unsolved murder of Jeff Steeves, AKA. Vulse G, after a car is found underwater. The car leads them to an elderly woman named Clarice Fry, which eventually leads them back to her grandson Timo, who has a connection to Jeff's former manager, Desecrate. Mickey is assigned to work the case of Lester Graham, a gambler who owed $20,000 to an on-line gambling company who is rumored to be very violent in their collection methods. Mickey is upset when Bailey asks her to San Francisco then takes his wife instead, but shrugs it off to Nicco.

When a trusted defence attorney crosses Mickey, she vows to exact her revenge, can the squad solve this one?

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.

Ali and the squad try to narrow the field on Sam Drainie, the former Ambleton security guard they believe is responsible for the shooting death of Ken Osborne, and possibly the deaths of Billy Wells and Michelle Ripley. Ali is also trying to juggle her personal life when she repeatedly makes and breaks dates with Vanessa's father, Dan.

Mickey partners up with an old flame to solve a case.

When one of Reid Logan's five wives shows up at the station, she tells Frank and Nicco that she believes the death of Louise Logan, Reid's only legal wife, four months ago was foul play. While investigating, Nicco is intrigued by Libby, the most recent wife who took Louise's place as Reid's only legal wife. Mickey is beaten up by a suspect in the brutal deaths of the Williams' and their baby, and although Ali tries to help her, she soon crosses the line in her zeal to get Price and his partner.

When the squad investigates the murder of an abortion doctor, old wounds are re-opened for the team.

Nicco take the lead in solving the case when Mickey lets him take charge, they find the criminal wearing a overcoat.

When Ali hears that suspected killer John Watts is about to be extradited for trial in Texas, she's determined to get him convicted in Canada of the murder of Gus Johansson to save him from the dealth penalty, which she does not agree with. When Ali and Agent Mitchell (who is there to extradite Watts) try to question the suspect, he grabs a cop's gun and holds Ali hostage. Nicco is accused of sexually assaulting the police psychiatrist, Leanne Walker, but maintains his innocence to Andy because what they did was consensual. When he tries to talk to her, she makes it clear that if he wants her to drop the charges, she has to come back to therapy with him. Mickey agrees to check an apartment for Christine's replacement, Denise, and learns that the building has had a large number of rapes recently.

Still torn up over his separation from Wanda, Len relentlessly pursues a serial killer as Wanda seeks sole custody of their two daughters.

The squad interrogates four suspects in a 20-year-old murder.

The team investigate the death by drug overdose of an up-and-coming artist.

A murder hits close to home for Pawlachuk.

When the sister of a murder victim from a case Ali worked on years before is found dead in an alleyway behind a strip club, Ali investigates the murder even though she's not officially on the police force.