Inspector De Vincenzi is working against the clock. A body was found in his old school-friend Giannetto Aurigi's apartment in the early hours of this morning and the investigating magistrate wants to take over as quickly as possible. The trouble is, Aurigi owed the dead man money, has been acting strangely, and isn't trying to defend himself. Unless De Vincenzi finds strong evidence to the contrary today, the investigating magistrate will see it as an open and shut case, and that will be the end of Aurigi. But none of the evidence seems to add up.