When he first started seeing ghosts, Max mistakenly assumed everyone else could see them, too. Now, after years of being blamed for the pranks of mischievous spirits, Max is determined to do whatever it takes to make himself normal. But when he's sent to spend the summer with his eccentric grandfather, Ramhart, being normal becomes impossible.

Here in Glimmerville, bakeries sell enchanted pies, the lake is infested with mermaids, the town's beloved ghosts roam free, and Ramhart himself is celebrated as the world's most famous monster hunter. At first, all Max wants is to survive the summer, but the more time he spends in Glimmerville, the more he starts to wonder if he's finally found a place where he can truly be himself.

But when a supernatural attack steals Ramhart's soul, Max--with the help of a few new friends--must go on a quest to find his grandfather's renowned Field Guide, an enchanted book that contains all the knowledge Ramhart has gathered about defeating unearthly nemeses. And if they don't find the book fast, Glimmerville will crumble into chaos, and Max will lose the only person who's ever made him feel at home.