Seventeen Ain't So Sweet

Jane prepares for her high school reunion with Maura's help while waiting for Casey to fly back to Boston to be her date. However, he texts her, asking for a video chat. He informs her that his squad was activated, and he won't be there for the reunion. Maura, sensing Jane's disappointment, tells her that Jane is still going to the reunion with her. Jane tries to dissuade her, telling her there are a number of people she went to school with that she doesn't want see. Maura prevails, eager to get a taste of the public school, co-ed experience, and Jane reluctantly agrees. Once at the reunion, they meet a number of Jane's old classmates, including several of the "mean girls" that Jane dealt with in school as well as Steve Sanner and his wife, Emily, who used to be Jane's best friend. Steve gives Jane his number, telling her that he needs to talk to her, before leaving to talk to other classmates. After listening to another classmate, Rory, and his wife, Kate, one of the "mean girls", brag about their company, life, and family, Jane and Maura leave. Later that night, Steve is out on the football field when someone shoots and kills him. Jane and Maura arrive at the scene and Jane is shocked that it's Steve since she had just talked to him a few hours ago. The following morning, Korsak's ex-wife, Melody, who left him five years ago, shows up at the cafe. As the detectives work the case, they come upon evidence that points to Steve having an affair with Debbie, another old classmate. When Jane and Frost approach her to ask her about the affair, they become aware of a photographer taking pictures and stop him, only to discover that he's a private investigator hired by Debbie's husband because he also thought she was having an affair. The photographer shows them photographs that seem to prove that Debbie was having an affair with Steve and another unknown man. Meanwhile, Melody works to persuade Korsak to help her fund a yoga studio she wants to open. Hours after Frost and Jane talk to Debbie, she is found dead from an apparent suicide. However, her body was staged to look like a suicide and she was actually murdered. They also find that the unknown man she was meeting was an investigative reporter. Debbie had told him she had a friend who wanted to blow the whistle on something big. Shortly thereafter, Jane gets a call that yet another old classmate, Maria, is dead from a heart attack. Maura's autopsy reveals that Maria died because the valve in her heart, one that Rory and Steve's company makes, failed. Steve had discovered that the valves the company was making were faulty and wanted to reveal the information, but, because of a big business deal about to go through, Rory had threatened him to keep quiet. Not trusting that Steve would keep quiet, Rory's wife, Kate, had taken matters into her own hands and murdered both him and Debbie.