Some of My Best Friends Are Monsters — Bruce Coville

Stuart Glassman is back for another wild and wacky adventure with his friend Robert, a ghost who has a heart made of mischief. This time around Robert has cooked up a Jekyll Juice potion that actually works. (That's because he consulted with the ghost of the real Dr. Jekyll to figure out how to do it.) As if the monster potion wasn't bad enough, there is a mummy wandering around the camp, and it seems to after Stuart's friend, Brenda. The laughs and the scares come side-by-side in this fast-paced monster-filled comedy!By the author of MY TEACHER IS AN ALIEN and JEREMY THATCHER, DRAGON HATCHER