Though this takes quite a while to warm up, the actual heist caper stuff is quite fun to watch. James Mason "Calvert" is a bit of a crook. A sophisticate, but a crook nonetheless. He has two rather put-upon sons in "Stefane" (James Fox) and "Antony" (John Alderton). The sons are fed up with their permanently disappointed father and so when they learn that he is to move £1 million on a ship from North Africa, they engage the help of their pal "Segolene" (Susannah York) and of the man who can help them rob the ship at sea -"Duffy" (James Coburn). They put together and execute quite a…