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Possessing extraordinary powers, including the ability to bring artwork to life, twelve-year-old twins Matt and Emily are sought by villains trying to access the terrors of Hollow Earth, a place where demons and mythological beasts lie trapped for eternity.
- ISBN: 9781442458529
- Published: 2012 , Aladdin
- Themes: action and adventure, Fantasy and magic, growing up, Siblings
- Descriptors: England (UK), Fantasy, Intermediate (ages 9-14)
- No. of pages: 382