With the rookies on their own during a turbulent night in the station, a prisoner pulls a gun on Chris. IA's inquiry into the incident leaves the rookies thinking about the choices they made that led to that night's events and about the fine line between telling the truth and having each other's backs. Meanwhile, Gail is still trying to recover from her traumatic kidnapping. And while Chris is caught unaware by a surprise, Andy learns a secret about Nick's past.