Publisher blurb: When Pathfinder Colm Safan entered the Nethys-linked heart of the fabled dungeon known as the Ravenous Sphinx, the Pathfinder Society expected to solve one of Osirion's greatest riddles. Months passed with no word from Safan, and you and your fellow Pathfinders find yourselves dispatched into the desolate wastes of Osirion's notorious Parched Dunes to find the sphinx, find Safan, and uncover the mystery he sought. With a band of cloaked riders on your trail and a trap-filled dungeon ahead, will you solve the third riddle before time runs out?