The Last Odyssey is the 15th thriller in James Rollins' Sigma Force series, blending Homeric mythology with high-stakes espionage as the team investigates ancient advanced technology found in the Tundra. The plot follows Sigma Force, including characters like Painter Crowe and Gray Pierce, in a race to locate a hidden, dangerous subterranean realm, often described as a "clockwork terror." Read more about the book's themes and characters.