An affluent judge with an incurable brain disease with only months to live decides to become the guinea pig for a new brain transplant technique. The operation is a success, but the unfortunate brain donor was a young man with unfinished business, and soon the memories and desires of this young man overwhelm the judge.

A young girl marries the wealthy father of one of her male friends at college, but she soon finds herself falling for her new husband’s son. The husband finds out about the two, and comes up with what he believes to be a foolproof plan: he will frame his wife and his son for his own murder, then have the pair locked in a room in his remote, isolated estate–with his own dead body.

A speed-boat racer suffers amnesia after an boating accident and goes to his isolated villa to recuperate. His relationship with his wife is troubled, so he starts an affair (sort of) with the another woman, which results in one of the three of them being shot. But there are several more twists--and more murders--to come.

Three clumsy thieves come up with a robbery scheme against the "Grandi Magazzini Romani". They call to their aid a skilled "only by reputation" French burglar, Pierre Le Compte.