When a Riviera socialite's diamonds are stolen - the latest in a string of seemingly unconnected, but ever more audacious, jewellery heists across France - Elena flies in to investigate the insurance claim. It's a trip she's more than happy to make, as it gives her a chance to meet up with old friends in Marseilles - and, particularly, with Sam. In the pattern of these "perfect crime" heists Sam's beginning to see a master at work.