From the back of the book:
They Come from Beneath the Sea!
The deep waters of the Hellmouth Gulf have long concealed ancient mysteries, both wondrous and terrible. But these secrets have been submerged for too long, and the remote coastal village of Blackcove has accidentally awoken a slumbering horror from a bygone age. Strange creatures now venture from beneath the waves to steal townsfolk away in the dark of night.
Can the PCs discover the fate of Blackcove’s lost villagers? What secrets still lie hidden on the mysterious, ruined island just offshore, and what now lurks in the flooded temples beneath the isle? And what horrific fate lies in store for those unfortunate souls who fall prey to the island's eldritch influence?
From Shore to Sea is an adventure for 6th-level characters, written for the Pathfinder Roleplaying Game and compatible with the 3.5 edition of the world’s oldest RPG, and produced in collaboration with the patrons of Open Design. Inside you’ll find villagers slowly succumbing to the ancestral taint in their blood, tentacled abominations from the deep, debased fish-men, ancient Azlanti technology, and a secret stretching back millennia to the legendary empire of Azlant itself.
This adventure is set along the mysterious Hellmouth Gulf coast in the diabolical empire of Cheliax in the Pathfinder Chronicles campaign setting, but can be easily adapted for any game world.