After a car crash at the train station, a couple with the rare Rh-negative blood type arrive in emergency care. Hospital staff complete a transfusion but reveal both sustained severe head trauma and need risky surgery. Their son, identified as Mr. Brown, and relatives plead while staff prepare the best room and search for a specialist. They summon Dr. Williams, a friend of the victims, who rushes in as Yvonne learns her parents were hit. With the specialist present but the operation high-risk, their survival hangs on the decision to proceed.