The Mostly Invisible Boy

This debut novel by AJ Vanderhorst is set in an alternate USA where monsters roam and follows the story of mostly-invisible Casey Grimes, a perennial new kid at school who discovers a fortress in a colossal oak tree. This marks the entrance to Sylvan Woods, a secret society devoted to ancient, wild things. As Casey strives to belong while keeping his identity hidden, he and his friends must uncover ancient magic to combat the returning Butcher Beasts and save both Sylvans and civilians.