The powerful Joseph Zimmer begs the renowned but exhausted Dr. Scott to perform a lifesaving heart transplant for his son. Despite an assistant's protests about the doctor's health, Scott agrees to operate the next afternoon, but first he must accompany his wife to a prenatal appointment. His family's importance is highlighted, with his unborn daughter even favored by the King. However, after leaving his son Jack with strict instructions to respect the doctor, a sudden accident befalls Scott's wife, Sherry, throwing his crucial promise into jeopardy.