Ali and the squad attempt to tie the Premier to the murders of Michelle Ripley and Billy Wells, two teenagers at Ambleton.

Nicco risks his police career trying to save Billie from her pimp and from her addiction. Mickey and Ali wrap up the Ambleton case…or so they think.

Mickey tries to convince Harper and Pawlachuk that a pile of old letters holds the key to a teen-aged girl's murder. Ali teams up with a Russian cop to connect stolen Russian historical documents to a murder.

Len has a suspect delivered to him at an abandoned shelter in the forest in order to coerce a confession out of him. Ali and Mickey question a former teacher at Ambleton about the murder of two children there.

Testifying in a murder trial, Mickey gets burned by the defense attorney. Nicco tries to conceal the circumstances of his uncle's death.

Ali investigates the death of a woman involved in the art scene who died of a drug overdose. Tensions mount when Christine embarrasses Mickey in front of the criminology class Mickey is teaching.

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

Ali is assigned a cold case where a murder suspect's case was thrown out of court because of a coerced confession.

Ali investigates a former security suspected in one, possibly three, shooting deaths.

A murder investigation leads to dissension in the squad.

Ali presses to open a cold file when a convicted murderer makes a dying confession to one less victim than he was sent to prison for. Nicco and Mickey look into a pair of homicide victims at a reform school.

Nicco becomes personally involved in a case after a drug addict asks the squad to find her mother's killer.

The squad investigates the murder of the doctor who performed Ali's abortion years earlier.