A priceless manuscript has gone missing from the Pathfinder lodge in Almas, and the Pathfinder Society has traced its current whereabouts to a remote monastery off the coast of southwestern Nex. Arriving at the Monastery of the Unremitting Tide, the PCs face the suspicious scholars who study there, and in the process risk enraging an ancient spirit and uncovering a long-lost secret that, more than possibly costing them the stolen manuscript, could cost them their very lives.