Band of Outsiders (1964)

Odile is a naive and lonely girl who forms a friendship with two outsiders named Arthur and Franz. After he showers her with attention, Odile develops a crush on Arthur. The two men visit the suburban house where Odile lives with her aunt, Madame Victoria, and their lodger, Monsiour Stolz. Monsieur Stolz has a stash of cash hidden in a wardrobe in an unlocked room. With the reluctant complicity of Odile, Arthur and Franz are planning to steal the cash of the boarder.