The remote town of Willowside is an eager new audience for the Circus of Wayward Wonders. But just after the circus arrives, the town is beset by dinosaur-riding monsters from deep beneath the earth. When the town protectors go missing, the circus's heroes must unearth an ancient mystery, expose a cunning betrayal, and break the siege of the dinosaurs! The Extinction Curse Adventure Path continues with "Siege of the Dinosaurs," an adventure for 12th- to 14th-level characters.