A man named Bertram Smith recovers a lost miniaturized H-bomb from a crashed Air Force jet and sends a tape to police headquarters in Gotham, warning that he will blow the city off the map by midnight unless he receives $10 million in ransom. Only six hours remain till midnight, so there is no hope of evacuating the city. Batman and Robin are called in on the case. The two heroes enlist the aid of Big Brill, Gotham's head gangster, battling their way into his penthouse retreat before they explain their mission. Brill calls in his division chiefs to listen to the taped message from Smith and try and identify the background noises to place Smith's location. One of the men, "One-Ear," places it on his turf. Batman and Robin learn Smith's name and location from a TV repairman who fixed the tap