Elizabeth Loyacano

Erin is overwhelmed with guilt after a man she set free is accused of killing a cop. Also, Frank and Mayor Poole continue their game of political chicken over Frank's reappointment as commissioner, and Danny and Maria investigate a case of a cop who has gone AWOL.

The mysterious criminal mastermind known as "The Voice" returns, trapping Reese and Fusco in their own precinct with several armed gang members and the latest POI. Also, Root makes a shocking discovery.