Married to Gilbert Brand, Kathryn imagines her marriage to be a happy one. It's studded with the parties of her husband's rich, socialite friends. But their attendance at a party given by his business associate, Victor Milo, tarnishes Brand's suave image. Kathryn discovers Brand attempting to strangle another guest, the nightclub singer Claudia, who becomes Kathryn's bitterest enemy. Then her world begins to crumble as she learns that Brand is an unscrupulous criminal...and she begins a descent into terror.