Melt My Heart to Stone

Frankie and the team await the promotion announcement, only to learn that new detective Riley Cooper (Daniella Alonso), has instead been promoted. Dennis (Eddie Cibrian) returns, attempting to talk to Maura, who doesn't want to talk to him, since he hasn't spoken to her in three months. Jane and Maura are then called to the case of a dead woman inside of a statue. Frost discovers that there was a string of killings just like this one, making this a serial killing. Maura takes a reluctant Jane to Dennis' book signing, but they are called to another body in a statue. Jane wonders if the killer might be an apprentice to Hoyt, and asks Frost to check it out. Dennis visits Maura, professing his love for her. Jane finds a letter on her desk from the killer, telling her about the next killing. She is then called up to the coffee shop, where Lydia is having her baby. Frankie calls Tommy (Colin Egglesfield), who says he doesn't know anything about a baby. Later, Maura is shocked when Dennis shows up at the morgue to ask her to have a birthday dinner with him. She accepts. While investigating the case, the team discovers that a victim previously had a son taken away. Jane learns that the same drug used to earlier sedate Dennis was used in the victims. She deduces that Dennis is the killer, and races to save Maura. The team arrives, and Dennis puts a knife to Maura's throat, saying that she was going to be the next statue. He then tries to fall into a broken elevator shaft with Maura, but, releases his grasp, allowing Jane to save her by pulling her away in time. At Maura's home, Jane answers the door to find that Lydia has left her baby on the doorstep.