Erin's nephew, police officer Joe Hill, becomes aware of witness tampering in a trial; Baez forces Danny to help her find the killer of her favorite TV personality; Eddie questions her decision to become a police sergeant.

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.

Jamie partners with the FDNY to find the arsonist responsible for a massive fire at an NYPD evidence storage facility; Eddie asks Frank to put her on modified duty following her divisive arrest of an anti-cop protestor at a rally.