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In the season 5 finale, a husband's murder is investigated, but the case turns complex when it's discovered he may have been living a double life.
The squad tracks a serial sniper. Maura forges a friendship with a witness, who suffers from a condition that causes him to believe he's a wolf.
Jane and the squad team up with another detective who has a similar case to find a roadside killer. Maura discovers she's the victim of identity theft and enlists Angela to help track down the guilty party.
An over-eager private investigator inserts himself into the squad's investigation of a poisoned clothing designer and his missing wife. Jane asks for Maura's help when she discovers Angela is spending too much money.
A severed human foot washes ashore, triggering the squad's investigation. Meanwhile, Angela's search for a job proves unsuccessful, so she helps Korsak at the Dirty Robber.
Maura is worried she's lost her best friend after Jane jumps from a bridge to save a prosecutor suspected of murder. Meanwhile, Angela seeks a new job.
As the case proceeds against a prominent county prosecutor arrested for murder, Jane begins to have reservations about his guilt. Angela decides to teach Maura about what kids are interested in after hearing that Maura plans to meet Jack's 12-year-old daughter.
A man dies suspiciously in a bathtub full of ice during a heat wave. Angela tries to stay cool by drinking a spicy tea, but the beverage brings with it unforeseen romantic consequences.
The team joins forces with Korsak in a bid to crack a cold case. Jane, still unable to return to duty, takes unconventional measures to stay involved.
The team is tasked with investigating the mummified remains of a woman. Jane attempts to recover from her overwhelming loss.
The team must find a young witness to the contract killing of a woman. In the end, Jane puts herself in danger to save the witness' life.
A seller of rare books is murdered, drawing Jane and Maura into a realm of Celtic writings and coded confessions. Meanwhile, Angela's relationship with Cavanaugh begins to change.
While Maura is away at a Medical Examiner's convention, Susie uses her skills to help Jane solve the perfect murder. The son of an old friend visits Korsak which brings up unfinished business.
A wealthy woman with terminal cancer and only months to live is murdered. Maura meets someone who might be Mr. Right while teaching a class.
The team investigates when a man is found murdered inside his doomsday fallout shelter. Jane loses investigative focus when she discovers Korsak is considering retirement and Frankie is hiding a secret.
A killer uses online ads to find murder victims. Meanwhile, Jane discovers it's difficult to keep her pregnancy a secret.
A traumatized, blood-covered woman arrives at the station, claiming she killed someone but forgetting the identity of the victim. Elsewhere, the team mourns the loss of a friend and colleague.
Season 5 opens with the murder of a female jogger. Meanwhile, Jane tries to hide her pregnancy from her nosy mother, and Maura and Frankie face the fallout from their kiss.