Silver Rebels: Trials of the Drowned

From the introduction:

This micro-dungeon is a shrine devoted to a deity or saint who shepherds the souls of the drowned. If you are using this product as a supplement to Pathfinder #098: Turn of the Torrent, refer to that adventure for more information about the shrine’s location and purpose. If you are using this product in conjunction with another adventure, or simply on its own as a self-contained dungeon crawl, the following information is designed to provide some background about the shrine, its location, and its purpose. You should feel free to alter these details to suit your needs.