The squad in Station 19 struggle to recover from the revelation of the identity of the mole. As their commander scrambles to save his own career, the patrollers reach for connection to each other. Nick, still rocked by guilt over his involvement in a murder, seeks closure by trying to find out what happened to his missing cousin Kaz. Ben finds love and happiness with Nick's sister, Amelie, but struggles with the family he thought he'd left behind...