The old mansion stood silent beneath the pale winter moon. Detective Sarah Chen stepped carefully through the freshly fallen snow. Blood stained the pristine white carpet in the grand foyer. A crystal chandelier cast shadows across the victim's pale face. The butler discovered the body at exactly midnight last night. No footprints led away from the scene of the crime. Every door and window had been locked securely from inside. Sarah knelt beside the corpse and examined the strange wound. The deceased was wealthy industrialist Marcus Webb, aged sixty two. His cold fingers still clutched a torn piece of paper. Three guests had stayed overnight in the east wing rooms. Each one claimed to have heard nothing unusual at all. Sarah noticed the grandfather clock had stopped at eleven forty. Someone in this house was hiding a very dark secret. The game of cat and mouse was about to begin.