"Minerva, Mayhem And Millionaires"
Many Gotham millionaires become patrons of Minerva's Mineral Spa, not knowing that she is using her Deepest Secret Extractor to find out where they hide their riches. After hearing about the robberies, Batman immediately suspects Minerva, and he and Robin go in for a treatment. After escaping from a deadly pressurizer, Batman sends Alfred in to investigate incognito.
Good old Chief O'Hara managed to sprain his ankle playing ping-pong.