Nash tries to track down the builder of a heavily armed robot that robbed a convenience store and killed a cashier; Nick tells everyone that he is going to die on his next birthday; Joe learns that a valuable item was behind a painting he sold at a garage sale.

Harvey becomes attracted to a fellow "Deadhead," a mysterious woman who is the target of a murderous stalker; Joe is promoted to lieutenant, but discovers that his new duties mostly involve paperwork; Nick injures his leg and makes life difficult for Nash and Cassidy, who are trying to take care of him.