‘Le passe-muraille’ a.k.a. ‘Mr. Peek-a-Boo’ - Felix Labisse illustration detail from the French movie poster for the film, Le Passe Muraille, 1951, directed by Jean Boyer.
A civil servant who can walk through the walls falls in love with a girl and pretends to be a thief. Arrested, he manages to escape, confesses his love and discovers he has lost his gift.