A beautiful girl seeks the help of an attorney when her father vanishes. Soon, her aunt also disappears from a locked house in the dead of the night. The search leads to the infamous White Cat, a nightclub frequented by crooked politicians and now, murder.

The Window at the White Cat is another in the famous "Had-I-But-Known School" of mysteries founded by Mary Roberts Rinehart with the publication in 1908 of her first work, The Circular Staircase. The focus of these stories is the Gothic heroine, always in the wrong place at the wrong time trusting the wrong people.