The morning fog clung to the empty street. Detective Miller stepped out of his car. A single light glowed in the house. He walked toward the front door slowly. The knob turned easily under his hand. Silence filled the air inside the hall. A body lay at the foot of stairs. Blood stained the cream-colored carpet beneath it. Miller knelt down beside the victim. He noticed a small silver ring. The ring was missing its stone. Something glinted in the victim's closed hand. Miller carefully pried the fingers apart. A tiny key lay in the palm. He heard a floorboard creak above him. The killer was still in the house.