The Bad Sister (1931)

Sidney Fox ("Marianne") is the rather over-indulged daughter who falls for con-artist "Valentine Corliss" (Humphrey Bogart). When he manipulates her into forging her father's signature on a document endorsing his rather dodgy business venture, he absconds with the money raised from his life-long friends and colleagues and the girl - before abandoning the girl. Conrad Nagel ("Dr. Lindley") meantime has always had a soft spot for the spoiled girl even though he is loved from afar by her younger sister "Laura" (Bette Davis) so the deceit has a bit of a love triangle to it, too. It's an interesting example of both Davis (still only 23) and Bogart as youngsters learning their craft, and Fox is really the star - though her character is rather unattractive - with a gentle moral that offers little indication of just we ought to expect.