There was no crime on the Mediterranean island of Montebello.
Occasionally, it was necessary for somebody to be murdered, but that was only because the island was part of Sicily, and murder was a Sicilian tradition.
But Horatio Greene, who had spent all his childhood holidays on the sunshine isle and retired - early - to live there, knew that locals left their keys in the lock on the outside of the door, and that there'd never been a stolen car...