When a heat wave hits the city, Alex is appointed Trauma Team Leader as the hospital is faced with an influx of patients during a blackout. With no back-up power available, Dawn and Charlie must figure out a way to continue their surgery as Joel and Maggie attempt to keep a patient alive while stuck in an elevator.

When Alex is forced to put a patient's gender reassignment surgery on hold, she discovers a secret in his medical history that could save his surgery, but tear his life apart. Charlie deals with a patient who is healthy, sane - and convinced she is going to die at midnight. Meanwhile, Joel secretly helps Sonja deal with a patient of hers who's been admitted to Hope Zion Hospital.