Detective Comics #242

THE UNDERWORLD BAT-CAVE Brainy Walker uses an elaborate treasure-hunt ruse to trick Robin into revealing the location of the Batcave, and intends to force them out of their headquarters. Robin falls for Walker's bluff and reveals the location of the Batcave. In reaction Batman prepares a set-up for the criminals along with the help of Alfred, who impersonates Bruce Wayne and makes the criminals believe that the Batcave is in fact a fake location prepared as a trap to capture them. With the location of the Batcave a safe secret once again, Walker is arrested and taken to the Gotham State Penitentiary. THE MAN WHO COULD MAKE MONEY THE THIRTY FATHOM SLEUTH To search for evidence at the bottom of the ocean, John Jones is outfitted with a diver's suit (which he doesn't even need) and sent to look for it.