Rizzoli gets a bravery medal after escaping from a hostage situation. A brave US military private is also felicitated but is killed by a car bomb after the ceremony. Rizzoli, resting for the last three months and yet unfit, investigates.

A pregnant woman is stabbed to death but Dr. Isles saves her baby. The husband is suspected. Police find that the baby is surrogate and has also been sold online in adoption. During kangaroo volunteering, a suspicious nurse is observed .

From among thousands of sailors in Boston during Fleet Week, an unknown sailor is suspected of two rapes and murders. Admiral Frost appears and he and his son Detective Frost do not see eye to eye. Policeman Rizzoli Jr. plays a part.

When the daughter of a police officer is kidnapped in front of her younger brother, Jane and the team race to find the girl, fearing her abduction is connected to another case in which a young girl turned up dead only hours earlier.

The Boston Pilgrims baseball team is co-owned by a man and his estranged wife. Rizzoli and Dr. Isles probe the mysterious deaths of the team's coach and a star player. Tom Rizzoli, a home burglar now out on probation, is misunderstood.

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.

Evan Dunbar and son Chris, customs brokers, are attacked, killing Evan and injuring Chris. Chris' subsequent actions and Evan's brother, just released, are suspected. Isles' old flame Dr. Faulkner visits and Rizzoli's mom is suspicious.

22 year old Melissa finds her dock-working father's work place injury fishy. Her subsequent murder has the mob's M.O. But, an injured Doyle, the mobster and Isles' father, claims innocence. Rizzoli frowns on Isles' chess game with Tom.

Jailed Hoyt is dying of cancer and Randall, his fellow inmate, is murdered. Hoyt conveys confusing images to Rizzoli who then attempts to connect deaths of Randall and of the four Wilsons in 2005, to Hoyt. Rizzoli's birthday is celebrated.

When a warehouse fire kills a firefighter, Jane and Maura must investigate whether it was arson or an accident. But the investigation hits a snag when a hit-and-run leaves someone in the hospital.