Ploum, ploum, tra-la-la

A police inspector tries to capture international robbers who are actually also police.

A man remembers all the incredible stories that took place in his hotel.

A gangster, thief of atomic formulas, has a double in the person of a naive musician. A music hall artist who makes eyes at the musician is deceived by the gangster who also takes advantage of the resemblance to track down a band of thugs who are chasing him. Virtue is ultimately rewarded.