Jane and Maura investigate the mysterious death of a young boy whose family is from Cape Verde. It appears at first that he may have died during an attempted exorcism, and it may take a message from beyond the grave for Jane to pinpoint exactly what happened. Jane is distracted from the case when her mother sets her up on a surprise date.

After a student is gunned down in broad daylight, the investigation reveals she had more than a few secrets. Meanwhile, Jane's mother Angela gets into a spat with her father over the car.

Rizzoli and Dr. Isles look at the death of the head of the rich, Brahmin Fairfield family. Dr. Isles once dated the dead man's brother and Rizzoli feels that this is hampering work. Rizzoli's mother peddles juices with dubious benefits.

Rizzoli and Dr. Isles run the Massachusetts Marathon and find a dead runner at Mile 3 and Mile 12 marks. Impossible to get back-up, and fearing more deaths from panic and stampede, they silently endeavor to solve the crimes as the race continues.

The actions of Hoyt, alias the Surgeon, and Rizzoli's nemesis, from inside solitary confinement spook her. While Rizzoli is off the Hoyt case, Dr. Isles does facial analysis of Hoyt for clues on murder/ disappearance of a married couple.

An unknown man is killed with an ice pick pierced into his ear. Police find that he is Colin Doyle, son of the Irish mob enforcer, Patrick Doyle, the actual target of gang rivals. Dr. Isles is in an emotional upheaval about the dead man.

An under-cover cop is killed by a drug ring. They then attack police HQ to retrieve a crucial piece of evidence found by Rizzoli at the crime scene. Rizzoli, Dr. Isles and others are trapped inside the HQ. A shoot-out ultimately ensues.

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 Rizzoli and Maura Isles find themselves investigating a death that occurred during the re-enactment of of a Revolutionary War battle organized by a university professor, Dwayne Cravitz. They soon determine that far from being an accident, the shooting was from a sniper who was actually out to kill Cravitz. A DNA sample leads them to believe that the shooter is someone from his past. Maura meanwhile is thrown for a loop when her mother, the rich and beautiful Constance Isles, drops in for an unexpected visit. They have a strained relationship however with Mrs. Isles not quite sure how to be a mother to her daughter and Maura feeling intimidated and reduced to babbling in her presence.

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.

After the murder of much-loved community leader Elmore Gregory, Dante Morgan steps forward to identify the shooter as a gang leader, Terence Jones, also known as Little T. On the night before the trial, Dante leaves his police protected hotel room and is found dead the next day in a gang-ridden neighborhood with "snitch" written on his forehead. With the main witness out of the way, the only other evidence against Jones was obtained using information from one of Vince Korsak's confidential informants. When Vince says he can't produce him for the court, the judge gives the prosecution 48 hours of the case will be dismissed. Meanwhile, TV's Bill O'Reilly is in Boston to cover Little T's trial. Jane's mother Angela is a big fan and at a book signing she gives him Jane's cellphone number.

Jane's younger brother Tommy seems to be settling down. He's getting work here and there and is moving into his own apartment. He still sees Maura from time to time but she would like to keep their relationship a platonic one. Meanwhile, the homicide squad investigates a bank robbery where the manager was shot by one of robbers for no apparent reason. They immediately cross swords with the FBI who also have jurisdiction and Det. Barry Frost in particular seems to have it in for the Special Agent in charge, Anna Farrell. This is the second robbery committed by these men and they soon find the getaway vehicle with one of the robbers inside, shot to death. It all becomes very personal for Jane when her brother Tommy's fingerprints are also found in the vehicle.

After her boyfriend Casey Jones is unable to get to Boston, Jane takes Maura to her dreaded high school reunion. She hates most of the people there but one former classmate that she liked, Steve Sanner, says he would like to discuss something with her. Before he can do so however, Steve is shot and killed while taking a walk on the football field. The killer used a steel wool-filled water bottle as a silencer. He worked for another high school classmate, Rory Graham, who says he wasn't having any trouble at the office or with co-workers. Based on his phone records, they suspect he may have been having an affair with another former classmate, Debbie Tibbet, but when she is found dead her husband tells the police she had recently become very secretive. A third dead classmate gives them the clue they need to identify the killer. Meanwhile Vince Korsak's ex-wife is back in town wanting money for a new enterprise. Vince would like to see his 16 year-old son Josh.

Jane and Maura investigate the stabbing death of Denise Ryan, who stumbled onto the stage at her daughter Dakota's dance competition with a pair of scissors in her chest. According to the dance studio owner, Coach JJ, Denise wasn't like the other moms and didn't get to know her very well even though Dakota has been going there for two years. The husband is eliminated as a suspect but the police responded to a disturbance at the dance studio two weeks ago when two of the other moms, Yvonne and Kim, got into an argument. When they learn that Denise had no credit history whatsoever, they realize that the plastic surgery she underwent was likely to hide her true identity. Korsak meanwhile has been avoiding his ex-wife Melody who wants him to co-sign a lease so she can open her yoga studio. He learns that his stepson Josh has been arrested for shooting a policeman with his own gun. Joss is angry and refuses to speak to anyone.

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.

Jane and Maura's friendship suffers following the shooting of Maura's biological father, gangster Paddy Doyle. Jane also finds herself in the middle of an Internal Affairs investigation. And her relationship with Agent Dean is exposed.

Jane and Maura still aren't on speaking terms but are forced to work together when a college student, 25 year-old Rachel Lawson, is found strangled in the university's underground tunnels. She had also been renting a car every weekend for the last 20 weeks and was aware that her parents has separated. She had also spent a good deal of money on yoga in recent months. The yoga master, Sensei Matta, has recently bought 20,000 acres in Western Massachusetts and has a secret - one that lead to the death of Rachel Lawson. Meanwhile, Jane is surprised when her father knocks on her door. He has big news: he's going to be remarried - to a 28 year-old - but wants a church wedding so needs to have his marriage to Angela annulled. Tommy, who introduced his Dad to the woman, is having his own particular problems with the nuptials.

Jane and Maura investigate the murder of an army veteran, 29 year-old Bernard Avery, who was killed in an alleyway with a hatchet. He was homeless, one of many ex-servicemen now living on the streets of Boston, and suffered from PTSD. When Rizzoli and Korsak visit a psychology center where Avery had sought help, Jane is surprised to find her old friend Casey Jones working there. He's been back for several months but refuses to tell her anything more. The police soon have a second dead homeless vet and Jane's informant, Rondo, thinks he's found a witness. Meanwhile, Maura meets Dennis Rochmond and after saving his life, he sends her orchids. She also discovers her wild side.

Young female professionals dressed as dolls are turning up dead on the public transit system, and Jane and Maura must piece together the clues. Angela implements new ideas for the café. And Jane learns more about how Casey was injured.

Jane looks for a way for Maura to meet her biological mother, Dr. Hope Martin. Angela gets involved in a political campaign. And a nun from Jane and Frankie Jr.'s past returns.

Jane and Maura go undercover at a sex party to track down the perpetrator of a sex related murder in a mansion that's on the market. As Maura and Hope get better acquainted their relationship turns out to be especially important for Hope's daughter Cailin. Meanwhile, Sister Winifred tries to maintain some level of civility in the squad room.

The investigation of the murder of two doctors is hindered by a judge that won't sign a search warrant for his own personal reasons. Jane has to deal with a delusional secret admirer.

The gruesome murder of a bride and the disappearance of her sister lead Jane to a crazy jealous rival and a bigger even more gruesome criminal enterprise. Meanwhile Jane's brother and partner are dating Jane's next door neighbor which conflicts with Jane's moving plans but Jane is more concerned about her neighbor's profession.

Jane investigates the death of a family friend in a boy band with a history of drug abuse. It looks like a drug case until drug tests come back negative and another rocker turns up dead. Maura's soft heart drags Jane into assisting with Lydia's pregnancy despite her disapproval of her mother's relationship with Lydia.

Frankie's promotion to detective goes to someone the detectives have a history with. The man Maura saved in the morgue returns to a cold reception. The case of the week is a body encased in plaster on public display on a fountain and it's not the first or the last.

The murdered man is in AA with Vince's ex-wife-he is not her husband. He lost his high-paying job in a pharmaceutical company and now is just a lowly pharmaceutical rep with a conscience, a past, and a plan for redemption.

A famous author who apparently hanged himself, a charitable gift for helping put a man on death row, a nagging feeling, a health program for the squad room, a suicide chat room, an evasive witness, a mother who insists her son is innocent, and a man who fell from a roof make for another week of mysteries and distractions in Jane's and Maura's investigations.

A mentoring program, a fire alarm, Angela's missing wallet, and Angela's breakup with the lieutenant distract the detectives as they track the killer of a microbrewer through cyberspace.

Casey drops some big news to finally explain to Jane why he's keeping his distance. Barry's mother plays ringer in an interoffice softball game then announces she's getting married. The detectives investigate the murder of a an ex-football player who ran a bakery.

Hope is ready to talk to Maura about a kidney for Cailin. Jane pays an unannounced visit on Casey. A substandard building related to a murder investigation endangers Jane's friends.