A man named Lewis discovers an underground cavern which is located directly beneath a gold depository. He accidentally reveals this information to some criminals, but refuses to show them where the cave is. The hoods frame his daughter, Linda, for murder in an attempt to force the information from Lewis. He gives in and tells them. Batman investigates Linda’s disappearance and proves that she is not a killer. He frees Lewis and his daughter, then goes to the cave to stop the crooks from robbing the depository. Finally, Lewis assists both Batman and Robin in defeating the crooks.