Ballad of Bullywug Bog

Publisher's blurb: Enter this journey in the tales of a mysterious tree and it's many realms, in this adventure the players get to travel to a realm called Tetradclover. This realm has fallen into trouble after one of it's residents went missing. Said resident will task you to find some of their missing masks that have been scattered around the realm. As the first adventure in the carnevale series you are going to a mysterious swamp looking for the lost masks. Can you find them all, and can you figure out the reason why everything has become corrupted?