The owner of a car dealership for the rich and famous is murdered, and at his funeral Carlo meets escort Anna Galinda. This is the last time anybody sees her alive. The police waste no time in making a connection between the two crimes and calling Monterossi in for questioning. But who was Anna in reality? And did she really know something about a hidden treasure?

The investigation by Police points toward Enrico Domini, a man who, years before, had been the prime suspect of a kidnapping case. Meanwhile, Carlo and his friends, in cahoots with Sargeant Ghezzi, find Anna's real home, along with other important clues.