Jaime goes undercover with a deadly human trafficking ring. Danny and Baez investigate a homicide connected to Danny's old partner. Frank grapples with whether to publicly support Mayor Chase on a policy decision and Eddie is determined to teach a young shoplifter a lesson.

Frank grapples with the personal loss of his best friend and how best to help his daughter when she lands in jail. Jaime and his nephew race against the clock to reunite a trafficking victim with her sister. Danny and Erin clash when she goes behind his back.