"Vidocq" - well that's the name he ultimately elects to stick with - has something of the "Oliver Twist" to the story of his birth. His mother was a petty thief, constantly in and out of jail, so he decides to follow in the family tradition where he (now George Sanders) meets "Emile" (Akim Tamiroff) and the two set about making themselves their fortunes! Their lively adventures eventually take them to the home of the influential Marquis de Pierremont where using a fair degree of guile - and having secured the amorous attentions of his grand-daughter - he finds himself chief of police and ideall... les resten.