The only monster in Will Collin's life is another fifth-grader named Otis, who bullies him into being his flunky. Then Will has a brush with a mysterious rift that gives him a glimpse into a different world--and imbues him with the ability to do magic! Everything changes--or does it? As Will soon discovers, even magic is no help if you don't have the nerve to stand up for yourself. And when a monster from the other world slips through the rift and begins killing dogs and demolishing police cars, it gives Otis an idea that could cost Will his life.
[I realize SFF isn't normally your area, but I would greatly appreciate your comments anyway--and if JK Rowling's agent ever puts up a Crapometer, please let me know!] well, I'll do my second best for you, and of course, it's my great joy to keep you posted on opportunities from the person you'd prefer. No problem.
Too bad Otis isn't the main character. He's much more interesting to me. You need some specifics here and "cost will his life" is as overdone a "stake" as we've got.