Spy in the House of Eth

From publisher blurb: SPY IN THE HOUSE OF ETH is a hexcrawl set on a mangrove-warrened coast. The twisting inlets shelter pirates and Dugong-Men; the limestone karst hides rogue Automata and abandoned forts. Everybody has a stake in the supernatural smog now gradually spreading over this territory—the incursion of an infernal alter-reality. Having completed his hostile takeover of Hell, Samsun Eth is finalising a merger... This is an Adventure Best Left Buried!