Jamie and Eddie find themselves at odds when Jamie learns that Eddie's close friend Tracey may be using the restaurant she owns as a drug front. Also, Erin forms an alliance with Anthony and her ex-husband, Jack Boyle, when she is accused of causing the suicide of a former colleague; Frank weighs whether he should fire a female officer who has an online profile featuring naked photos of herself; and Danny and Baez try not to be influenced by their own biases when they are faced with various descriptions of the same suspect.