In a large apartment house in central Rome, two crimes are committed within a matter of days: a burglary, in which a good deal of money and precious jewels are taken, and a murder, as a young woman whose husband is out of town is found with her throat cut. Called in to investigate, melancholy Detective Ciccio, a secret admirer of the murdered woman and a friend of her husband’s, discovers that almost everyone in the apartment building is somehow involved in the case, and with each new development the mystery only deepens and broadens.