Jack, Scott, Emily and Drift the dog investigate the mysterious case of a spy in hiding in the tenth Adventure Island mystery.

Helen Moss was born in 1964 and grew up in Worcestershire and Saudi Arabia. After a degree in psychology and philosophy at Oxford University, Helen went on to do PhD research at Cambridge University. She recently spent a year in Portland, Oregon, with her family, and on returning decided to switch direction and devote herself full-time to writing books for young readers. Helen lives in a small village outside Cambridge with her husband, two teenage sons, two border collies, two gerbils, several hens and a bearded dragon called Frankie.