S5, E10: Andy and Sam are in such a good place, that Andy can’t help but feel she’s waiting for the other shoe to drop. So when Andy learns her former rookie, Duncan, is back on active duty and hoping to reconcile, she decides this is what her anxiety was anticipating. But it’s all hands on deck when a car bomb explodes in a downtown parking garage – quickly followed by a second explosion at a busy intersection. Duncan, eager to prove himself as a worthy officer, goes rogue only to come face-to-face with the bomber. It’s up to Andy and Nick to get the situation under control and save Duncan before they run out of time.