Hoping to avoid the new inheritance tax, eccentric millionaire Jasper Whyte (Charles Grapewin) gathers together his greedy relatives and associates and announces that he intends to give away his fortune to his long-lost granddaughter Doris -- but if she doesn't show up for the reading of the will, the money will be divided evenly among the heirs. Among those present are two girls (Mary Carlisle and Evalyn Knapp) who both claim to be Doris. When one of the girls is poisoned, Whyte's heirs waste no time blaming each other for the murder. After an attempt on the life of the remaining girl, the suspect list narrows down to Whyte's great-nephew Tom (Regis Toomey). Combining forces with two-bit vaudeville magician Joe Luvalle (Wallace Ford), Tom manages to expose the genuine murderer. Written by Stuart Palmer of "Hildegarde Withers" fame, One Frightened Night is a class act all the way, from the inventive opening-title sequence to the exciting finale.