The detectives at the twelfth precinct try to track down a counterfeiter and find out why he's passing phony bills. Wojo and Levitt get called to a medical office after a man attacks a cosmetic surgeon after he discovers she had work done while he was on a business trip.

When a robbery suspect is brought in by Wojo, the detectives soon discover he is in the witness protection program after testifying against the mob. After he and Dietrich get shot at while on a call, Harris realizes his partner saved his life and starts acting strangely as a result.