Chicago Hope's doctors struggle with adversity when the power goes out on a blustery, winter night. Keith endures a drunken Irish engineer to try to get a backup generator on-line. Dr. McNeil tries to explain life and death to Sara Wilmette and Cacaci's son when they're trapped in an elevator together. Aaron strives to help a teenage girl found bleeding from her hands in a church. Billy contends with a pregnant (and hormonal) Diane. Kate doubts herself when a very expensive computer program disagrees with her diagnosis.