Saigon, 1975. You are Daniel Cross, a British MI6 operative embedded as an anesthesiologist in the city's main military hospital. Your mission was simple: sabotage the evacuation helicopters to keep American weapons out of North Vietnamese hands. But now, with the last chopper scheduled to leave in six hours, you discover your own sabotage has created a fuel leak that will kill everyone on board—including your pregnant wife, Linh. To save her, you must dismantle the bomb you built, all while performing an emergency cesarean on a dying general's mistress. But the bomb's detonator is synced to your own heart rate. The only way to stop it is to stop your heart—permanently.