The Leviathan's Tomb

Publisher blurb: For the 5th edition of the world's most popular roleplaying game! An ambitous [sic] lord scrambles to reclaim his family's keep, a fortress of solid iron that rises from a storm tossed sea. The true nature of the keep has been lost to time, but an ancient evil stirs beneath the waves. Will you brave flooded dungeons, face brutal sea monsters, and outwit the masters of the Leviathan's Tomb?