For years, Mr. Meacham has told tales of the fierce dragon deep in the woods. To his daughter, Grace, these stories are little more than tall tales, until she meets Pete. Pete is a mysterious ten-year-old with no family who claims to live in the woods with a giant, green dragon named Elliot.

Sixth grader Peter is pretty much the average kid: he likes gaming, hanging with his friends, and his beloved pair of Air Jordans. But when he has to give up his most prized possession -- his bedroom -- when his recently widowed grandfather moves in with Peter's family, he's unwilling to let such an injustice stand. Peter devises a series of increasingly elaborate pranks to drive out the interloper, but Grandpa Ed won't go without a fight.