Wealthy philanthropist Adam Penfield dies, and in his will is left a provision for his last gift: money to be used to build a House of Batman, a headquarters in the center of Gotham City to be used by Batman and Robin. The dynamic duo themselves learn of the gift after it is constructed, and after they learn from a crook they catch that safecracker Mayne Mallock is back in town. The house is equipped with all manner of security devices, including a rotating "bat" with TV-eyes on the roof of the house. Batman and Robin use the House of Batman as their headquarters for a few days, during which time Mayne Mallock cracks safes and eludes their every attempt to catch him. They deduce that Mallock has some means of learning their plans and patrol-routes, which he does, having designed the House