Helen Moss, illustrated by Leo Hartas

A string of unusual crimes hits Castle Key and the chief suspect seems to be a skeleton! Scott, Jack, Emily and Drift the dog immediately start investigating, but nothing about the mystery makes sense.
Will the friends finally be defeated by this baffling mix of crimes and the mysterious culprit, or can they uncover the sinister secret that connects them all?
The sixth gripping mystery in the exciting new Adventure Island series!