DOUBLE DYNAMITE

Meek California Fidelity Trust teller Johnny Dalton asks his boss, J. L. McKissack, for a raise so that he can marry fellow teller Mildred "Mibs" Goodhue. Although Johnny's request is declined, Mibs wants to marry him anyway. Emile J. Keck, a friend and waiter at an Italian restaurant that they frequent, also urges Johnny to take a chance, even facetiously suggesting that he rob the bank where he works. When Johnny insists on waiting until they can afford to marry, Mibs is enraged.

Johnny spots two men attacking a third in an alley and intervenes. The victim, "Hot Horse" Harris, is a bookie. In gratitude, Harris gives Johnny $1,000, but Johnny refuses to accept it as anything but a loan. Harris bets the entire amount on a sure thing in a fixed race, placing the bet at the bookie joint run by his competitor. From the winnings, Johnny retains $5,000. Harris places two more bets for Johnny, both winners, bringing Johnny's total to $60,000. Harris has only $40,000 on hand, so he tells Johnny to collect the rest the next day. Johnny shares the good news with Emile, but Emile believes that Johnny followed his advice about the bank robbery.

The bank's auditors have discovered $75,000 missing. Fearing that he will be suspected of the crime, Johnny enlists Emile's help in hiding the money. Mibs does not believe Johnny's story. She is alone in his apartment when $20,000, the remainder of what Harris owes Johnny, is tossed through the door. Still believing that Johnny stole the money, she seeks Bob Pulsifer Jr., the lazy, lecherous son of the bank's founder, and offers it to him only if Bob will not inform the police about Johnny. However, he phones the police.

Emile poses as a millionaire and redeposits the remaining funds in Johnny's bank, hoping that it will be the last place where the police will look. This attracts the attention of R.B. Pulisfer, the reclusive head of the board of directors, who insists on meeting Emile, hoping for a donation to his charity. Emile registers at an exclusive hotel and maintains the millionaire ruse with Johnny's money. R.B. finds Emile refreshing, and their friendship helps to clear Johnny.

Mibs insists on driving Johnny to Mexico, but they are caught. They are surprised that the police know that Johnny had won the money. The police instead arrest Mibs, as the auditors have tracked the missing $75,000 to her. However, Johnny accidentally discovers by that Mibs' adding machine is malfunctioning. Mibs tells a man whom she thinks is a reporter about all of the expensive gifts that Johnny has given her, only to learn that the man actually works for the IRS.

Johnny's boss McKissack has been fired for falsely accusing Johnny and Mildred and takes Emile's waiter job.

Johnny is cleared of embezzlement after it's revealed the missing bank funds were due to a malfunctioning adding machine, not theft, and his boss is fired for wrongly accusing him.

The film wraps up its farcical misunderstandings with a mechanical error as the true culprit, not Johnny’s supposed criminality. This allows for a comic inversion of expectations, with the real stakes—love, reputation, and employment—restored. The ending doubles down on the film's lighthearted tone, ensuring everyone lands on their feet (except the uptight boss).