Nash and his team take the subway home from a bachelor party and are held hostage after walking into the midst of a robbery. Meanwhile, Lisa takes Cassidy to the emergency room when her daughter complains of severe pains but triage is a nightmare.

Nash is stuck with an eleven year old delinquent who's the link to busting a drug kingpin. Joe is reunited with his grown son J.J. and Nick wreaks havoc with Nash's attempt to find him a live in nurse.