Clive Brook stars as "Heliotrope" Harry, a gentleman thief tossed in jail for killing his wife's lover. Before turning himself in, Harry leaves his baby girl on the doorstep of a rich, childless couple. Desperate to keep his lush of a spouse Lilly (Olga Baclanova) away from their girl, he tasks his former partner Froggy with making sure the kid turns out OK. Once Harry is out of the clink, he impersonates his daughter's butler to protect her from Lilly, who will stop at no underhanded trickery to get her hands on the girl's money.