The body lay crumpled beneath the grand marble hotel staircase. Detective Sarah Chen arrived just as dawn broke over Seattle. She stepped carefully around the pool of dark, congealing blood. The victim wore an expensive tuxedo, now stained and ruined. His glassy eyes stared upward at the crystal chandelier above. Nobody had heard him fall during last night's charity gala. Or perhaps someone had heard, but chose not to speak. Sarah noticed the victim's gold wedding ring was mysteriously missing. The hotel manager wrung his hands, pale and visibly shaking. "This will destroy our reputation," he whispered to nervous staff. Sarah ignored him, focusing instead on the victim's clenched fist. She carefully pried open the stiff fingers with her gloved hand. Inside lay a torn piece of expensive cream colored stationery. Only two words were visible: "I know" written in black ink. Sarah photographed the evidence before placing it into her bag. Upstairs, two hundred guests slept, unaware of the murder below. One of them had killed this man just hours earlier. And now Sarah had exactly twenty-four hours to find them.