The Pathfinder Society is called upon to aid the fledgling nation of Vidrian! As the PCs sail beyond the edge of the Inner Sea and into the waters off the coast of southern Garund searching for new trade routes to connect Vidrian with new allies, the PCs find themselves amongst the iruxi, a civilization of lizardfolk astrologists. While the iruxi themselves seem to be likely allies, other forces stir in the nearby jungles, and if the PCs hope to return north with news of a newly charted route, they will need to first face an ancient evil whose presence complicates navigating the treacherous ocean ways.