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The Dynamic Duo are tied to a conveyor belt of a hole punching machine that creates paper music rolls for player pianos. Batman observes how the machine operates, and deduces a clever way of evading perforation by calculating the notes necessary to make the plunging punches miss and then overpowering the sound of the piano. When he and Robin capture Harry, Harry squeals that a guy named Fingers is the ring leader. Batman deduces that Fingers and Chantell are the same man, and soon unravels the rest of the evil plot.
Robin: Holy metronome! What a fate. Punched into piano player rolls.
Batman: True, Robin, scarcely an end I'd ever anticipate. Life, a cupful of surprises to the last drop.
Batman: A new super-criminal with a plan for getting the entire Wayne fortune. To put it pithily, this Fingers fits like a glove.
Robin: The masher, I'll fix him!
Batman: Hold it, old chum. We mustn't give ourselves away.
Robin: Self-control is sure tough sometimes, Batman.
Batman: All virtues are, old chum. Indeed, that's why they're virtues.