In the fifth season premiere, solving the murder of a jogger takes on even greater urgency when Jane realizes that the motive was theft ... of the woman's baby. As the investigation gets underway, Jane attempts to hide her pregnancy from her snooping mother, and Maura and Frankie face the aftermath of their kiss.

While everyone grieves Frost's loss, they must investigate a murder without a body, or a crime scene, when a young woman arrives at the station in bloody clothes, carrying a gun and confesses to a crime she can't remember.

A killer is using online ads to find the perfect candidate for murder: men no one will notice are missing. Meanwhile, Jane discovers that keeping her pregnancy quiet will be a tough assignment.

A man is found dead inside his doomsday shelter. Maura determines he was suffocated by gas pumped into the shelter. Jane becomes distracted when she thinks Korsak is going to retire. Frankie has a secret.

The team investigates the murder of a wealthy woman with terminal cancer and only a few months left to live. When Maura teaches a class, she meets a man who might be her Mr. Right, but she is torn between the doubts of her scientific mind and the instincts of her heart.

With Maura at a medical examiners' convention, Jane needs Susie's (recurring guest star Tina Huang) help and crime scene dioramas to solve the perfect murder. Meanwhile, Korsak is visited by the son of an old friend and forced to deal with painful unfinished business.

A rare book dealer is tortured to death for no apparent reason. Maura tries to find time to introduce Jane to Jack, and Angela makes some changes.

A woman is killed with a silencer outside a nightclub. First suspect is the husband who checked into a hotel, but he is found dead. A young witness to the suspected contract killing of the woman must be found and protected.

Mummified remains of a woman put the team's investigative skills to the test. Jane works from her hospital room as she - with the support of Maura and her family - seeks to recover from a devastating loss.

The team helps Korsak investigate an old case that has gone very, very cold. Jane refuses to believe that she's not ready to go back on duty and takes some untraditional steps to stay involved.

In the middle of a heat wave, Jane and Maura find a man who died suspiciously in a bathtub full of ice. In trying to stay cool, Angela discovers a spicy tea that seems to be working, but it has unexpected romantic consequences.

A notable county prosecutor is arrested for murder, and as the case against him grows increasingly strong, Jane begins to doubt he did it. Angela nominates herself to educate Maura on the interests of kids today when she hears Maura is going to meet Jack's 12-year-old daughter.

After Jane jumps from a bridge to save a prosecutor suspected of his murdering his mistress, Maura is terrified that she has lost her best friend. The squad must now renew the search to find the real killer. Meanwhile, Angela enlists Frankie's help as she applies to new jobs.

When a severed human foot washes up on shore, the squad is called in to identify the victim and track down the murderer as more body parts are found. After an unsuccessful job hunt, Angela finds she enjoys helping out Korsak at the Dirty Robber.

The squad is forced to join forces with an overeager private investigator when a successful clothing designer is found poisoned and his wife reported missing. Jane notices Angela is spending too much money and asks Maura to teach her mom how to handle her finances.

After a man is found bludgeoned to death on the side of the road, Jane and the squad team up with another detective who believes he is hunting the same roadside killer. Meanwhile, Maura discovers she has had her identity stolen and recruits Angela to help track down the culprit.

The squad works overtime hunting down a serial killer sniper. Maura befriends a man who is a witness to the crime, who happens to suffer from a mental condition that has him believing he is a wolf.

When a blindfolded and handcuffed woman is the only witness to her husband's murder, the detectives search for a motive for the seemingly senseless killing. Jane tries to cheer Maura up after her break-up.