Ghosthunters #4: Ghosthunters and the Muddy Monster of Doom!

Ghosthunters #4: Ghosthunters and the Muddy Monster of Doom! by Funke, Cornelia. paperback edition. ISBN: 9780439862691.

More frightening fun for 7-to-10-year-olds from the phenomenal Cornelia Funke! Book 4 in the spooky-silly GHOSTHUNTERS series. Intrepid ghosthunter-in-training Tom has battled Incredibly Revolting Ghosts, Gruesome Invincible Lightning Ghosts, and a Totally Moldy Baroness. But it ends up nothing--NOTHING--is more frightening than...final exams. To earn his Ghosthunting Diploma, Toms got to nab a Deadly Messenger: the hardest ghost of all to catch. And while on the hunt, he stumbles into the yucky, mucked-up lair of a mud-dripping minotaur demon whos assembled a ghoul army with the goal of world domination. Suddenly theres a whole lot more at stake than Toms graduation: This is one test the team cant fail!