The first piece of sleight-of-hand is the title, setting audiences up for the opener in a crime series featuring the eponymous French character. A terrific twist at the climax shows exactly why this would not be turned into a series, though one critic who clearly didn’t watch the whole picture thought otherwise. And you can see why because it’s old-fashioned enough to provide you, Agatha Christie style, with a string of suspects, adding in and leaving out enough information that it’s hard to work out who the criminal mastermind might be.
For four years, a burglar has been terrorizing Europe, stealing diamonds almost at will. The expert on his methods is French cop Duval (Anton Diffring), a debonair confident chap with a distinct Gallic charm, who happens to be in London when the thief – known only as Mr March – strikes again. Only this time, taken by surprise, he murders socialite Alice (Angela McCann). British detectives Insp Wilson (Mark Singleton) and Sgt Hastings (Patrick Bedford) are only too happy to welcome Duval’s assistance, especially as he appears to have the keener eye.

In short order we are introduced to Alice’s maid Doreen (Susan Halliman) who discovers the body. She’s recently entered into a relationship with the disreputable Charley (Charles Roberts) and may have deliberately or inadvertently given away the secret of where Alice hid her diamonds – and it wasn’t in the safe. Alice’s friend Jackie (Diane Hart) enters the equation because her boyfriend Mark (Aiden Grennell) has been trying to tempt Alice into investing in a property deal. And may have been sufficiently annoyed with the brusque way she gave him the brush-off to have killed her. Mark has an alibi for the time of the murder, which took place in the middle of the night. But it’s an odd one. He claims he chose that time of night to pay a visit to his lawyer to discuss a business deal. And his manservant Brossier (Charles Mitchell) is an odd fish.
Jackie is revealed as grasping and only too happy to do Mark’s bidding, which includes some unusual instructions. Doreen is too trusting and somewhat dim. Charley is definitely dodgy and has been paid to provide information extracted from Doreen as to the jewels’ whereabouts.

There’s another complication. Because of the murder, the diamonds are now too hot to handle and can’t be quickly shifted by a dealer in stolen goods.
You can wallow in the nostalgia, pipe-smoking cop, nothing wireless about the telephones, a couple of scenes set in a milk bar with youngsters dancing to a record. There’s even a car chase.
The initial sequence is stylish, with a strong hint in the play of light and shadow of film noir, and though it tends to stick to police procedural there are enough twists and characters with hidden agendas to keep the plot wheels turning, with Duval turning his nose up at the ineptitude of the British copper.
With his haughty features and blond hair Anton Diffring (Counterpoint, 1967) had been typecast as the arrogant Nazi or German officer – so this was something of a career break and I guess if a series had developed he might have found a different niche. This proved to be Diane Hart’s (The Crowning Touch, 1959) only movie of the decade, and Angela McCann’s sole picture.
With an abundance of red herrings and twists, director Max Varnel (A Question of Suspense, 1961) keeps the action moving at a clip. Written by J. Henry Piperno (Breath of Life, 1963).
Worth it for the suave Anton Diffring and the twists.
Catch it on British streamer Talking Pictures TV.




