School caretaker "Flatfoot" Mason, a former Music-hall artiste harbours a secret. He has a daughter, Betty who unbeknownst to her was adopted when his wife died. Now a teenager, she's a pupil at the school, which causes complications when the staff feel that Randle is being "over attentive" to Betty. Told to steer clear of her, Flatfoot reluctantly agrees, but Betty thinks he's rejecting her and decides to run away to make her name in show-business. Randle, assisted by his fellow caretakers, trace her to a seedy cabaret club and tries to persuade her to come home, but will she listen or risk spiralling into a life of debauchery?