"Dual Alibi" is a good crime story with a twist; the protagonist(s) are identical twins. It appears to be a British attempt at the noir genre and the mood is dark and humorless, reminiscent of the 'Twilight Zone' TV show.
As I said, the story is good and is somewhat predictable throughout. Herbert Lom stars in the dual role, a high-wire circus act from the continent. One of the twins gets snookered by a con-man agent and his girlfriend and there is a falling-out, with predictable results. I was not as enthralled with the picture as most other reviewers but I appreciated the irony of the plot and the acting of Lom, who carries the picture.
Nice work turned in by the two chiselers, Terence De Marney and Phyllis Dixey, who has only 2 films to her credit. This movie is so old I was unable to readily spot Sebastian Cabot, who in hindsight looked very young and slimmer than I remembered. He had a speaking part which lasted a few minutes, plenty of time to recognize him. If you are interested in "Dual Alibi" you should know that it is hard to come by nowadays - and it's good, but not great, in my estimation.