John gets an unexpected request from his ex-wife just as he, Ben and Chickie are sent out as part of a maximum deployment to capture the "Canyon Rapist," a perp who has been impersonating a cop. Lydia gets re-partnered with Russell for a double-homicide case. And Sal gives his wife Susan a special gift to commemorate her promotion, but their night turns into a disaster when their daughter reveals Sal's affair with TV news reporter Mia Sanchez.