The storm arrived without warning. Detective Sarah Chen drove faster. Lightning illuminated the old mansion. She parked near the entrance. Rain hammered against her windshield. The butler opened the door. His face was extremely pale. "Thank God you've come, Detective." Sarah stepped into the foyer. A woman's scream pierced upstairs. They both ran toward it. The bedroom door stood open. A man lay completely still. Blood pooled beneath his head. The widow knelt beside him. "My husband is dead now." Sarah surveyed the entire scene. Six guests had attended dinner. Now one of them murdered. The killer was still here.