Jake and Mal are called to check into some death threats that have been made to a respected psychiatrist; an old "friend" from the past shows up and makes an interesting proposition to the Doyles; after Leslie's close call, Jake and Leslie find themselves struggling a little in their new romantic relationships.

The Doyles are hired by a real estate agent to investigate a series of strange occurrences at the site of her controversial housing development; Leslie uncovers some suspicious facts about the Mayor; the tension between Jake and the Mayor hits a high point; Allison makes Jake a serious proposition.

Jake buys an expensive gift for Allison only to have it stolen by a thief; The Mayor finds himself in a compromising position and asks for Jake's help and his silence; Mal has trouble telling a lie to his kids; Leslie thinks she's being followed.

The extended Doyle family shows up on the doorstep unannounced and in huge trouble, leaving Jake and Mal to tangle with some formidable gangsters from across the pond.

It's no laughing matter when a comedian is being stalked, and the Doyles are on the case to find the stalker; Jake gets some inside info on Allison.

When an old Doyle family friend accidentally goes missing at sea, the Doyles are hired by his daughter to find out what really happened; Jake is forced to bail out Christian and picks up another line of business and a pile of new debt.

When Tinny and Des are snatched from the safety of the Doyle home in broad daylight, Jake is forced to confront a dangerous man from his past (Paul Gross) to get them back; Leslie loses something else very precious to her; Jake makes a decision about his future with Allison.

Jake and Mal are hired by a man to find his wife, who he claims is alive and well despite being reported dead for years; Tinny takes her investigation into Crocker a step further; Leslie embraces Jake as a confidante.

Jake's worst fears are realized upon discovery that Leslie has gone missing while working her dangerous undercover assignment, and now he's determined to find her at all costs. Meanwhile, an unlikely and suspicious client enlists Des's PI services.

The Doyles are hot on the trail of an international art thief; Constable Hayward makes a grave mistake with career-impacting implications; Leslie struggles as she deals with an important family issue.

Mal and Rose try to keep an old friend safe and find out what kind of business he’s really into. Jake is laid up with a bad injury and his medication causes some strange dreams.

Jake traces a sketchy money trail; Leslie faces some conditions upon her return to work.

Leslie offers to help Jake and the Doyles.

The Doyles work with Jimmy and Wolf to protect a witness; Jake and Saul face off again; Rose discovers something about Sloan's past; Jake gets shocking news.

The Doyle's try to keep their stories straight during a police interrogation; Leslie and Jake keep secrets; Des and Tinny disagree on their relationship.

A new case gets Jake and Mal caught in the middle of a daylight-kidnapping gang, which they quickly discover is all just a game. The game takes a sinister turn when one of the players turns up dead, and it's up to the Doyle P.I. Agency to find the killer in a very real murder. Des practises his investigative skills by tailing Tinny and finds out some very disturbing information.

In order to find out where some stolen goods are, Jake gets himself arrested in order to be jailed with the thief who knows the location; Mal finds out some information about Rose that she's been keeping hidden from him.

When a member of the Doyle clan is in danger from both the police and a killer, the family comes together to stay safe.

It's matrimony -- Doyle style -- as Jake and Mal are tasked with finding the person responsible for sabotaging an upcoming wedding; Mal and Rose fix a bump in the road in their relationship as Jake and Allison hit a stride in theirs; Des comes to Tinny's rescue but ends up exploding her plans in the process.

The Doyles reluctantly take on a case from a dodgy "old friend" when he promises them a big payday; Jake and Allison encounter friction when their professional lives impose on their personal relationship; Jake gets an interesting job offer from an unlikely source.

When Des finds himself in a very bizarre and compromising position, the Doyle clan works overtime to get him off the hook; Jake meets someone who has been complicating Allison's life; Tinny and Des start coming to terms with their feelings for each other.

Crime novelist Garrison Steele returns again to both hire and torment Jake to help him research a murder case; Jake and Leslie struggle to keep their mutual affection for each other in check; Allison receives some much-needed help from Jake.

Jake Doyle is forced to help his high school nemesis track down missing money and win back the heart of his estranged wife; Des must decide between Chandra and Tinny once and for all; Rose and Kathleen take a step forward in their friendship.

Jake and Mal are given no choice but to help an escaped convict prove his innocence, and they get a glimpse of the drug trade in the city in the bargain. Tinny's curiosity about her father grows. Jake finds out why Leslie's been off the radar.

After a ransom drop goes bad, Jake and Mal fight against the clock and an unpredictable man to find the location of a kidnapped girl; Tinny shares some shocking news; Leslie slips deeper into her risky assignment.