Even though he announces that he will take the till from the Kentucky Derby, Lupin's first strike, on the transport car, fails. A despondent Lupin jumps straight into the Hudson River... but it's all part of his scenario. The main act is a supposedly perfect, supposedly foolproof cracking of the Metropolitan Bank's vault. How will Lupin penetrate an alarm system that sounds loud bells at the weight of even a handkerchief?