When Nuttel learned about the secret of the open window, he felt really bad for poor Mrs. Sappleton. However, as the evening descended into an eerie twilight, the atmosphere thickened with a sense of threatening dread, and Nuttel acknowledged the presence of four beings beyond the open window. Who will be those four beings? What will be the secret of the open window, a real tragedy, or some made up story? Read this amusing and thrilling tale to discover all the twists and turns and learn about the secret that lies behind the open window.