"THE BLACKNESS!
IT IS SEEPING TOWARDS US..."
A faceless stranger is close to finding the key that opens Hollow Earth: a supernatural place that holds all the monsters ever imagined.
Twins Matt and Emily Calder have special powers
- they can bring art to life. But can they find their missing mother and protect the key - an ancient bone quill - even if it means travelling back through time? Then Matt takes a fateful decision, one that forces him to make a terrible choice.
Save his family? Or save the world?