When the body of a young, unidentified hooker is found in the district, aspects of the crime and Dutch's conviction that this murder is the work of a serial killer persuade David to provide Dutch and Claudette the full resources of the Barn. Dutch has 24 hours in which to break the case before the clues grow cold and resources are demanded elsewhere. While Dutch, with the aid of an FBI profiler, wrestles with the responsibilities and pitfalls of leading his first large-scale investigation, Claudette revisits an old case that has haunted her through her career. The precinct focuses on canvassing the neighborhood for leads on the dead hooker's identity. Danny seriously contemplates taking the sergeant's exam and Julien wrestles with whether he should follow through with an affidavit regarding Vic's theft of the Armenian gang's drugs. Vic and the Strike Team uncover an underage prostitution and pornography ring. Vic must take quick, brutal action to protect one of his informants unsettled by the murder spree.