Annie's world was turned upside down after her older brother Jamie went missing years ago. Growing up, she and Jamie were inseparable, and together they created a fantasy world called Gumlea in the woods behind their house. But when Jamie entered middle school, they began to grow apart. After Jamie's disappearance, everyone else gives up hope of ever finding him, but Annie refuses to believe he's really gone, and she becomes certain that Jamie somehow entered Gumlea and she is the only one who can rescue him.