Richard Todd is PI "Mercer" who is sent to Venice by a grateful French insurer to track down a man whom they want to reward for his sterling service during WWII. On arrival, however, things start to go seriously pear shaped, corpses abound and soon he must stay one step ahead of traitors and police alike as he tries to fathom out what's going on - and to save his own bacon. Despite a cast including a glamorous but rather static Eva Bartok ("Adriana"); an efficient George Coulouris as the dodgy Police chief "Spadoni" and an oddly cast John Gregson ("Uccello") this film doesn't really catch…