Almost every afternoon, the Woman in the Purple Skirt sits on the same park bench, where she eats a cream bun. Unbeknownst to her, she is being watched by the Woman in the Yellow Cardigan, who is always perched just out of sight, tracking her every move. After the Woman in the Yellow Cardigan persuades her to join her as a hotel housekeeper, the Woman in the Purple Skirt begins an affair with the boss, and in this "deliciously creepy" tale (Kirkus Reviews), the two women will be on a collision course.