The grandfather clock struck midnight in Lady Pemberton's drawing room. Detective Sarah Mills arrived precisely as the screaming had started. She found the butler standing over the victim's lifeless body. Blood pooled beneath the crystal chandelier on Persian rug patterns. "Nobody must leave this mansion tonight," Sarah commanded them all. The seven dinner guests huddled together near the marble fireplace. Lady Pemberton clutched her pearl necklace with trembling pale hands. "Lord Pemberton is dead," the butler whispered through thin lips. Sarah noticed the study door was slightly ajar and suspicious. A letter opener protruded from between his shoulder blades deeply.