Will his monster-y special effects pranks get him kicked out of school before the class trip to Crab Shell Pier, home of the Mountain Full of Monsters ride? Or will Desmond be able to keep his monster magic in check? Someday Desmond will be famous for his special effects wizardry, but for now he's just trying to make it through 6th Grade, which means he needs to stay one step ahead of the school's disciplinary officer, Mr. Needles. The only problem is Desmond just can't stop pulling pranks like the time he attached a shrieking rubber goblin to the toilet seat in the teachers' bathroom. Mrs. Rubin screamed so loudly her wig flew off! And now Desmond has to stay prank-free for the rest of the year, or he won't be able to go on his class excursion. It's going to be tough, but Desmond has to try.