Bored, lonely, and starving for adventure, eleven-year-old Emily Pine finds her life turned inside out when she moves to a new town and meets her fascinating neighbor, Steven, who introduces her to a secret world called Alcovia. As if that were not odd enough, of course, the only way to get there is through the old hollow tree in his backyard As they journey through the dazzling heart of Alcovia, they encounter forests of hungry trees, long abandoned rooms covered in dust, and sparkling sea caves that all contain traces of dark and chilling secrets. There must be a frightening place lurking...