After taking a bullet in the Season Finale during a siege of the precinct, Jane Rizzoli is honored as a hero at a public event. The celebration is short-lived, however, when disaster strikes. The ensuing case reunites Jane with an old high-school flame, Sgt. Major Casey Jones, who may be just the person she needs to heal her emotional scars.

Jane and Maura's relaxing day at an outdoor spa is anything but when they discover the murder of a pregnant woman serving as a surrogate mother. Soon the hunt is on to find the baby's biological parents.

Shortly after sailors invade the streets of Boston for Fleet Week, a young girl is found dead. Frost's father, a Navy Admiral, comes to town, causing tension with his son. And, Maura goes on a date with Angela's mechanic.

Jane and Maura investigate after the coach of the Boston Pilgrims baseball team is found dead in the locker room. The death comes as a star player and the team owners battle for control of the team. Meanwhile, Jane's brother Tommy returns home after being released from jail.

A Revolutionary War re-enactment becomes the scene of a real killing when a soldier turns up dead. Maura's extensive knowledge of American history becomes important as she and Jane try to solve the case. And Maura's brilliant mother, Constance Isles, comes to Boston for an art exhibit.

Jane and the team investigate what appears to be a modern-day witch hunt in Salem. Meanwhile, Frankie's old girlfriend returns to town with a surprise, and Jane has no problem speaking her mind about the situation.

Jane and Maura investigate a family's background when a man is killed; Jane suspects that Maura is hiding something.

When a young dockworker is found dead, the team discovers that there are mob connections; Jane tries to avoid sensitivity training; Maura starts spending time with Jane's brother.

A serial killer claims to have clues about the murder of another prisoner; Frankie Jr. prepares to take the detectives exam.

The shooting of a community activist brings out a witness who's willing to testify. TV host Bill O'Reilly airs his disapproval of the police department.

Boston Homicide teams up with the FBI after a bank manager is shot during a robbery. Jane’s brother Tommy may be facing more trouble just as his relationship with Maura begins to grow. Tessa Thompson guest-stars as by-the-book FBI Agent Anna Farrell, who has a complicated history with Detective Frost.

Jane vai à reunião de antigos alunos do liceu e leva Maura consigo. No entanto, a diversão é interrompida quando um dos seus antigos colegas aparece morto no campo de futebol. Jane tem de se concentrar no passado quando se apercebe que todos os seus colegas são potenciais suspeitos.

O mundo da dança profissional torna-se mortal quando a mãe de um bailarino é esfaqueada até à morte numa competição. Jane e a equipa procuram pistas, mas depressa se apercebem que há algo de estranho na vida da mulher.

Quando um incêndio num armazém tira a vida a um bombeiro, Jane e Maura investigam se se trata de um caso de fogo posto ou se tudo não passou de um acidente. Mas a investigação ganha outros contornos quando um atropelamento e fuga faz uma vítima que precisa de ser assistida no hospital.