When a food truck chef dies suddenly, all signs point to a suspicious poisoning, but many questions remain unanswered. Meanwhile, Tommy (recurring guest star COLIN EGGLESFIELD) announces some big plans that have Angela very excited. And Maura's birth mother, Hope (recurring guest star SHARON LAWRENCE), 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 (recurring guest star COLIN EGGLESFIELD) 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.
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.
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.
The murder of a rare bookseller brings Jane and Maura into the world of Keltic writings and coded confessions, just as Maura is preparing Jane to meet her new man. Angela's relationship with Cavanaugh changes pace.
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.
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 (recurring guest star ENVER GJOKAJ - Vegas, Dollhouse) 12-year-old daughter.