In the explosive season premiere, the Doyles and Leslie finally find out where Jake has been all this time but he's brought some trouble back with him; Tinny oversteps her professional bounds; a stranger with a keen interest in Leslie comes to town.

Jake meets his match in a wily bail-jumper who he must bring back to the city ? a task made very difficult when an old nemesis interferes; Tinny can?t stay out of trouble, even while suspended; Mal and Rose keep tabs on a Crown Attorney who might not be on the up and up.

Jake and Mal have to keep up with a mysterious girl who gets one over on them; Des feels a deep connection to the case; Jake and Leslie face an unexpected surprise.

Troublemaker Martin Poole comes back and Jake and Mal have no choice but to help when a man?s life is on the line; Tinny makes a big decision about her personal life; Leslie tells Jake some shocking news.

Novelist Garrison Steele returns and pulls the Doyles into an unusual murder investigation; Tinny moves on from Grayson; Jake zeroes in on a new enemy; Leslie tries to come to terms with the sudden change in her life.

Jake has trouble filling in the blanks when Sloan goes missing; Des avoids an awkward confrontation with Tinny; Jake and Leslie come to a crossroads in their relationship.

Jake takes a fishing trip with Mal and Des and uncovers a murder mystery in the woods; Rose runs into a notorious frenemy with plans for Sloan; Des keeps a secret from the Doyles.

Jake is taken hostage and must investigate from inside an unusual, high stakes robbery; a trapped Mal risks his safety to help Leslie. Sloan?s secretive behavior has Rose and Des alert.

Leslie joins forces with Callum after her informant is murdered; Jake gets involved in Callum?s business; Tinny?s constable skills are tested on a big case.

Jake crosses paths with a familiar hot headed cop, Jimmy O?Rourke (Scott Grimes), while chasing a super hacker; Mal and Rose negotiate their way to a windfall; Des becomes apprenticed to a slick new Master.

Jake pursues a missing painting and a convicted art thief out for revenge; the Doyles are on edge after a brutal attack on one of their own; Sloan struggles to find her place in the family.

Jake must release himself from a debt to a Montreal mob boss by locating a clever hustler. Leslie becomes suspicious of a fellow officer's motives. Jake is rattled by a visit from his exwife.

Jake is forced to team up with his fugitive former partner Kevin Crocker who?s determined to clear his name; Leslie must step up when a colleague is attacked; Des wrestles over telling Jake an important secret.

Jake and Des team up with Toronto Policeman, Bill Murdoch (Yannick Bisson) after discovering a severed foot in a storage locker; Leslie shoulders the weight of new responsibility; Mal avoids unwanted family obligations.

Jake and Mal investigate death threats surrounding a construction magnate and her airport expansion. Recently released ex-Mayor William Cadigan Clarke is back and looking to settle old scores bringing Jake and Leslie together to uncover Clarke's plans. Rose and Des discover something missing from the Doyle office safe.

Jake evades the police while racing against the clock to find a loved one who?s being held hostage; Leslie battles a nightmare come true; the Doyles face a shocking betrayal from one of their own.