The Doyles help a close family friend beat a manslaughter charge despite the fact that he refuses to defend himself; Jake's relationship with his ex-wife, Nikki, is heating up when it should be cooling down - and Leslie might be the perfect distraction.
The Doyles show their sentimental side as they help Jake's high school girlfriend run off into the sunset with her new husband, who's running from both bad guys and good guys to just get away; Rose's past comes back to haunt her in the form of her ex-con husband, while Leslie weighs whether or not she wants Jake in her future.
Jake sets out to find the true identity of a beautiful amnesiac who stumbles across his path and ends up fighting off her two stalkers; Martin Poole refuses to leave town and wreaks havoc in Rose and Mal's relationship; and Leslie gives Jake the cold shoulder.
A grieving widow hires the Doyles to find out why her husband left a generous sum of money in his will to a woman she's never heard of. Rose continues to battle with Martin over their divorce while Mal formulates a plan to get Poole out of their lives for good; and Leslie and Jake hit a comfortable stride as friends and colleagues - just as his divorce from Nikki becomes final.
When a dubious chip truck owner notices his truck is missing - along with his driver/best buddy - he cons Jake into taking the case; Martin really crosses a line with Rose and she takes matters into her own hands; and Jake's divorce becomes final and he's happy to tell Leslie that he's now a free-agent. But Leslie's just been bumped up the ladder with a promotion to Sergeant, and her eye is on the job, not Jake Doyle.
When Jake receives a mysterious late night call from Christian, he's not prepared for the scary crime scene he finds at the other end of the line; Mal is suddenly and seriously sidelined and Jake takes the reins to save his tormented brother from the Police, including Leslie; Nikki makes a significant step in moving on from Jake; and everyone's trying to keep it together as their Republic falls apart.