Doris Dumond is called home from a convent school by her mother, who has purchased some diamonds and has sold them although she has paid only one installment of the price. Hammond, the dealer's agent, threatens to have her arrested unless she pays the debt within 24 hours. Doris, who is a somnambulist, enters Hammond's room at night while asleep, and purposely misconstruing her visit, he keeps her there. The house detective, her mother, and her sweetheart, Phillip, gather in the room; and with the exception of Mrs. Dumond, no one believes her story. That night, she again walks in her sleep in response to the cry of a baby who has strayed onto a window ledge in pursuit of pigeons, and she saves the child. With her innocence thus established, Phillip begs her forgiveness, pays for her mother's jewels, and is married to Doris.