Hollow Triumph (1948)

John Muller is a brilliant crook who plans a holdup which goes wrong, and is trailed by vindictive gambler, Rocky Stansyck. Hiding out, he stumbles onto a lucky chance to assume a new identity, that of psychiatrist Victor Bartok, who happens to be his virtual double. But Muller discovers that he is out of the frying pan and into quite a different fire.