Twins Matt & Emily Calder have imaginations so powerful they can make art come to life. Their powers are sought by villains intent on accessing the terrors of Hollow Earth - a place where all devils, demons & monsters lie trapped for eternity.
| Author | John and Carole E. Barrowman |
| Publisher | AudioGo |
| Year of publication | 2012 |
| Number of pages | 314 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 144584642X |
| ISBN-13 | 9781445846422 |
| Illustrator | Nacho Yague |
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