Frank and his grandson, Joe Hill, contend with a grievous insult to the memory of Joe's father; Erin and Henry work together to bust a scammer targeting the elderly; Eddie's captain takes suspicious interest in her efforts to locate a stolen puppy.

Eddie's former partner returns and brings an accusation of excessive force against an officer; Danny and Baez clash with a troubled foster child at the center of their latest investigation; Erin must make a tough decision about her campaign.

Jamie learns that Eddie’s close friend Tracey may be using the restaurant she owns as a drug front; Erin is accused of causing the suicide of a former colleague; Danny and Baez are faced with various descriptions of the same suspect.