-Detective Riley Cooper who had previously dated both Frankie and Frost while undercover gets the promotion to homicide. 

-A body is found in a statue. It's a hooker who has had her arms cut off. Two other bodies quickly pop up the same way and Frost finds out there have been others in different cities.

-Dennis Rockmond returns. It's been three months since his tryst with Maura but he never called.  Now he wants to reconnect.  He invites Maura to dinner at his place to celebrate his birthday.

-All of the victims were bad mothers. The oldest victim had her son taken away from her 30 years ago.  Jane searches his identity and realizes that he is Dennis Rockmond.

-The team rushes to Rockmond's address and find Dennis holding a knife on Maura.  He pushes Maura aside before jumping to his death.

-Lydia has her baby and leaves him on Angela and Maura's doorstep.