Valeros is a veteran adventurer whose life as a mercenary lies far in his past. When conflict erupts, however, more aspects of Valeros's past come crashing into the present day than just his soldiering days. Now, separated from his longtime adventuring companions by a burgeoning war and vast distances, Valeros must rely on new allies to prevent a diabolic dragon's sinister machinations from coming to fruition.

In an exciting race against the clock, Valeros must make himself part of the crew of the Wandering Star, under the command of former pirate and current Andoren operative Torius Vin, hoping to reach the site of a nascent Hellmouth—a living portal to Hell—before a dragon can use it and a sliver of a slain god to upset the balance of power in the region. With the aid of the enigmatic sorcerer and spy Vee, the naga oracle Celeste, and a young Eagle Knight with her own ties to Valeros's past, the iconic fighter and the crew of Wandering Star must overcome the forces of Hell with the fate of Golarion hanging in the balance.

From fan-favorite fantasy author Chris A. Jackson (Pirate's Honor, Pirate's Promise, Pirate's Prophecy), Operation Hellmouth promises an unforgettable adventure of infernal plotting and family drama on the high seas, set in the award-winning Age of Lost Omens setting for the Pathfinder Roleplaying Game. Operation Hellmouth is the perfect entry point to the Hellfire Crisis event within the Pathfinder setting, a multi-year conflict that will pit the world's most powerful nations into all-out war.