Famed concert pianist Chandell is being blackmailed by his evil twin Harry, who knows that Chandell used a player piano at the White House performance which made him famous. Chandell's plan is to woo and then marry Aunt Harriet, then dispose of Bruce and Dick in order to get hold of the Wayne fortune so he can pay his brother $5,000,000. Or, at least, that's the plan he told his brother... When Batman interferes, Harry and his piano movers get the drop on the Dynamic Duo, and feed them into a machine that makes player piano rolls - a machine that will leave them permanently perforated!