The Spawning Grounds

From the introduction: The town of Guion’s Ferry has a vermin problem, but these are not ordinary rats or insects. These are much more sinister creatures that can take the form of common objects to hide in plain sight before they attack! As Guion’s Ferry is a very small town, they have sent an emissary to a larger town downriver, hoping to hire adventurers to aid them in exterminating these monsters.