Ghosthunters and the Mud-dripping Monster!

Stuck in the mud. Ghoulhunting is a riot, but exams are not and Tom is taking his Third Ghosthunting Diploma. When he is sent to Bogpool, a misty, muddy village, it seems it's bog-standard ghostcatching and his diploma is in the bag. But he has entered a dirty trap, and as the village begins sinking into the mud, a beastly Ghost of Death arises, and the ghosthunters must face their gravest test yet.