The Stones of Venice

Arriving in Venice, Jason is surprised to learn that he is the apparent author of a book entitled 'The Stones of Venice', which he assuredly is not. However, after he is attacked by two would-be assassins, a jewel robbery takes place, and Theresa Bonival, employee of a firm specializing in antique jewellery, is abducted. These incidents are closely related to events in Jason's book, and therefore sufficient for the police to ask for his help in their inquiries.