Deserves to be more widely known
The 1940s was an amazing period for metaphysical films that could be simultaneously sophisticated and mainstream. La main du diable is a classic variation on the Faust story that lies somewhere between "A Matter of Life and Death" by Powell & Pressburger and the films of Val Lewton. Spookier than the former, yet not as spooky as the RKO films by Tourneur Jr. and Mark Robson from the same period. There's also a touch of Jean Cocteau, who gets a nod in the film ("Cocktails at Cocteau's !" shouts a typical French art lover as they prepare to leave an art exhibition.)
If you're a fan of any of the directors referenced above, or of late 50s to late 60s Ingmar Bergman, be sure to check this one out.