12-year-old twins Matt and Emily Calder are Animare they can bring art to life and enter paintings at will They must do everything in their power to prevent a breach in Hollow Earth a supernatural place that holds all the demons, devils and creatures ever imagined The Hollow Earth Society are getting closer to finding the key that will release the beasts an ancient bone quill whose powers can only be used by a powerful Animare The quill has been lost for centuries, but important clues to its whereabouts lie somewhere on the island of Era Mina - as does the entrance to Hollow Earth itself