A tall, strikingly blond man comes to a small town on the Mediterranean. In his luggage, a heavy revolver. His mission: to shoot Mr. Martini, a man he has never seen. The client, Michele, has blackmailed the killer with a letter. A not insignificant sum of money also plays a role, which is to be handed over to him after the job is done. But now the difficulties really begin - the killer is shadowed by two dubious types who watch his every move closely. In the web of sinister machinations, he too is only a puppet, hanging
helplessly on the strings of the great unknown.