The Decemvirate sends members of the Pathfinder Society to the former crown jewel of Ustalav's royal courts, the decaying city of Ardis. Tasked by the Society to look into the fate of Absalom's former Master of Blades, Vonran Vilk, what they find will lead to exploration, diplomacy, murder, haunted pasts, and tragic love. Can the PCs stop the rampage of the Midnight Mauler before he kills again?