Episode Overview
When the detectives fail to pursue John Donadoni, Joel and Fearless recruit Ray and Tom for a secret mission to locate the murderers of Wisnicki and Chandler. Their investigation leads them to Sabrina Fithian, prompting Joel and Fearless to infiltrate her apartment and wire it. There, they encounter Katherine Pierce, a Robbery/Homicide detective who has been tracking Sabrina and her accomplice, Rachel, the very criminals they seek. After Donadoni threatens Kelly and Willy, Joel warns him that his mother could be at risk. Encouraged by Joel, Katherine joins their team, gaining Ron's approval for her task force. Sabrina is apprehended during a burglary, but not before she injures Katherine and fatally shoots Rachel with Katherine’s weapon. Joel cautions Donadoni that he is now a target, regardless of the case's outcome.