Jane and Maura are asked to present the case of a serial killer at a symposium for law enforcement; Jane and Maura make a discovery.
The squad investigates when an amateur drag race turns deadly; Jane turns to Lt. Martinez for help and he seems to be thwarting her investigation.
A mock trial advisor dies during a competition; Jane is concerned that Angela may be hiding financial issues; Tommy hires a lawyer to settle his claim against the Storrow Center.
The squad tries to solve a homicide case that is muddied by conflicting evidence; Maura must decide if she is going to take in her recently paroled grandfather; Jane and Casey must decide between their careers and their relationship.