Among the Missing (1934)

Two young jewel thieves, Tommy and Gordon, stash their jewels on slightly dotty Aunt Martha to avoid the cops. They dupe her into helping them fence the goods. She moves in with the boys, and learns about their criminal activities. She helps reform Tommy, who is falling in love with local girl Judy. When Tommy agrees to one last job, it's up to Aunt Martha to get him out of trouble and save his burgeoning love affair with Judy.