Paul Standing, the son of a highly-respected doctor who has recently died, is winding up his father's affairs when he receives an account from a book-shop owned by two brothers (Michael and Ronnie Carey) demanding over a thousand pounds for pornography supplied to his late father. Paul knows that receiving this bill could have killed his mother, who has a weak heart - but he is suspicious of the claim, for a very good reason... (thetvdb.com)