The Pathfinder Society recently discovered that a rune-encrusted dagger in its vaults is somehow connected to an ancient weapon buried in the remote deserts of Thuvia. The weapon's precise location is unknown, so the Society dispatches a team of agents to explore the desert, using the dagger to guide the way. Unfortunately, the dagger is one of a matched pair, and the Society's enemies have its twin! Can the agents reach the weapon before their enemies do? What other surprises lay in wait?