Younger of two daughters who's been brought up according to the psychology book decides she's grown up and goes after the man whom mama had tabbed for older sister. At reception for older girl's cool swain, the kid, who'd been ordered to stay in her room, crashes the gate by posing as the family maid. She gets herself embroiled with a burglar (Frank Jenks) who takes her for a moll working the same racket. She and the burglar wind up at the home of the matrimonial catch later in the night.