A fatal traffic accident involving an elderly man and a cyclist may not be as open and shut as it seems, and Andy's romance with Detective Luke Callaghan also seems headed for a collision after she objects to how he handles a young murder witness with a bullet lodged in his head.

When Andy and Chris investigate a vicious nightclub beating, the probe takes a surprising turn. The two rookies must make a gut-wrenching decision that will send shock waves through the division and jeopardize their careers. Meanwhile, things get up close and very personal as Luke and Sam compete during a retraining exercise.