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 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 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.

In the season premiere, a community parade turns deadly and family tensions and politics arise. A surprise visit from Lt. Col. Casey Jones (CHRIS VANCE) reveals shocking news.

Jane and Maura investigate the death of a young woman who is found washed up on the beach. Maura confirms that she drowned and manages to trace the exact location by analyzing the water in her lungs: a tank in an old fish factory. Jane is somewhat upset to find that an old flame, police Lt. Rafael Martinez, is back in Boston. They had worked together in the narcotics division but their relationship ended after a confidential informant had been killed and Martinez left to join a special task force some 8 years ago. The dead girl is identified as Brenda Thompson, a journalism student who was pursuing a drug story on her college campus. When Jane finds Lt. Martinez's business card among her possessions, it seems that he was using her to get information. Meanwhile, Maura learns that she may be in danger owing to her father's activities.

Dr. Isles becomes the suspect in the murder of a mysterious guest of a charitable fund-raiser.

The hit-and-run murder of a high school science and driver's education teacher focuses on a group of friends who were also students of the victim.

When a food truck chef dies suddenly, all signs point to a suspicious poisoning, but many questions remain unanswered. Meanwhile, Tommy announces some big plans that have Angela very excited. And Maura's birth mother, Hope, takes a bold step toward making amends with her daughter.

Homeland Security steps in when a senator's daughter is found murdered. The squad rushes to solve the case, which could put national security at risk. Meanwhile, Tommy and Frankie get into a fight after Tommy starts slipping back into bad old habits. And Jane reveals some shocking news that could change her life forever.

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.

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.

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.

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 woman finds her husband has been murdered, the ensuing investigation reveals that the victim may have been living a double life.

Jane and Frankie chase a suspect where Frankie is involved in a shooting, of a possibly unarmed man.

Jane and Maura are called out to the BCU "Body Farm" (an academic research facility dedicated to the study of human decomposition) when a murder victim is found buried in a shallow grave among the research corpses. Angela has secrets she is keeping buried from Jane.

The murder of a notorious thief sends Jane and Maura into the world of art heists and forgery; Jane must deal with an FBI agent who is interested in her case; Angela has a new man in her life.

The crime lab loses one of their own. The team must set aside their personal feelings for the one they lost, & try to find out why their team member died & whether he/she was conducting illegal work on the side. Isles must accept that she cannot help with the investigation & Rizzoli has to adjust to working & solving the crime with another quick witted medical examiner.

Maura is kidnapped and Jane and the team do everything they can to find her before she is harmed. While abducted, Maura discovers a conspiracy that puts a target on Jane's back.

The crime lab loses one of their own. The team must set aside their personal feelings for the one they lost, & try to find out why their team member died & whether he/she was conducting illegal work on the side. Isles must accept that she cannot help with the investigation & Rizzoli has to adjust to working & solving the crime with another quick witted medical examiner.

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.

The murder of a notorious thief sends Jane and Maura into the world of art heists and forgery; Jane must deal with an FBI agent who is interested in her case; Angela has a new man in her life.

Dr. Isles becomes the suspect in the murder of a mysterious guest of a charitable fund-raiser.

Jane and Maura are called out to the BCU "Body Farm" (an academic research facility dedicated to the study of human decomposition) when a murder victim is found buried in a shallow grave among the research corpses. Angela has secrets she is keeping buried from Jane.

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 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 Frankie chase a suspect where Frankie is involved in a shooting, of a possibly unarmed man.