Watched the DVD of TEN DAYS WONDER, and although I'm sure it's not everybody's cup of tea, I thought it was a superb movie. Claude Chabrol directed brilliantly, and he comes up with some beautifully mesmerizing color camera work, although he does overuse the zoom lens a bit too much. It certainly contains Welles' best performance out of all the seventies films he appeared in. Just the fact that he is the major character in the film helps, since by this time, he usually did brief cameo's in which he clearly wasn't too interested in the roles he was playing. This is a part like that of Harry Lime where Welles dominates all the action, but unlike in THE THIRD MAN, he has a lot of screen time.
The film is admittedly very slow for a thriller, but it seems very much in the same style as Welles' own work on THE TRIAL. In fact it opens with a little homage to THE TRIAL, with a beautifully recited Welles' voice over, before we see Anthony Perkins waking up from a nightmare in a strange Paris hotel room, in a out of focus shot like the opening of THE TRIAL. Later, the character Welles play, Theo Van Horn, refers to a Labyrinth, and it's almost as if this very rich man is a composite of Mr. Clay from THE IMMORTAL STORY and MR. ARKADIN, in his attempts to play God with the life of his adopted son (Perkins).
Also, Welles appears in several scenes wearing his trademark black cape, smoking his cigar, as if he stepped right out of F FOR FAKE. Just for Welles performance alone, I'd say this is highly recommended viewing.