Simon Rose's fourth novel now available

The Emerald Curse, Simon Rose's fourth novel for young readers, is now available from Tradewind Books. Here's the description from Simon's website:

Charles Kelly was the world's greatest comic book artist, until he disappeared without a trace. Two years later, his grandson Sam discovers a mysterious pen in Kelly's attic studio. Sam is soon propelled into a bizarre dimension, where super villains are all powerful and disturbingly real, and finds himself in a deadly confrontation with an evil entity, imprisoned inside a mystical gemstone since the dawn of time.