Fed up with the pressures and demands of her acting career, the famous Myra Marlowe leases a house in the tiny New England hamlet of Beaver Haven, and settles down to write her autobiography. She is successful in turning aside the offers pressed on her by her long-time agent, but dealing with her nosy, omnipresent neighbors is a different matter. In an attempt to shoo them away, and gain some privacy, Myra invents a mad, homicidal sister--who is kept locked in an upstairs room, but who occasionally escapes long enough to scare off uninvited visitors. The ruse works well, at first, but complications result when the local handyman develops affection for "Sister Sadie" (really Myra in a fright wig) and some of the more officious ladies decide it is their Christian duty to save the poor demented Sadie's soul. In desperation Myra announces that her imaginary sibling has suddenly gone off to Boston--which brings on the sheriff, and the suspicion of murder! Needless to say, all is straightened out in the end, but the uproarious doings will keep audiences laughing right up to the final curtain, and then some.