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

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

A murder investigation leads to dissension in the squad.

The Squad continues to work on the Ambleton case, feeling they've hit a break when they arrest a former student, Shelley Mack, who tells Mickey and Ali about parties that used to be held in the Love Shack, with Desmond Cage in attendance. Nicco tries to help Billie beat her addiction and get away from her pimp, but when he can't find her a place in a rehab clinic he tries to help her go cold turkey. Andy has no choice but to turn over the Ambleton files and all evidence on Desmond Cage when a request from higher up comes down.

Nicco becomes personally involved in a case after a man who takes drug's asks the squad to find his mother's killer.

A case from Pawlachuck's past comes back to life and forces him to face up to some personal demons he thought he had escaped for good and from this he learns a few things about himself in the progress.

Ali gets assigned to work the cold case of Jessica Tyson. Gerald Lee had confessed to the murder, but because his confession was a direct result of a cop threatening his life, the case was thrown out of court, and Gerald Lee protected under the double jeopardy law. It isn't long before Ali becomes convinced that the evidence against Lee isn't quite as good as they thought it was. Nicco, Len and Mickey continue to investigate the Ambleton case and Drainie's connection to Desmond Cage, and soon learn that Drainie had been buying computers and computer parts on a regular basis. While trying to further the investigation, they learn the mounties are also investigating Drainie, and have taken the squad's best evidence with them.

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

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

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.

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

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