The Gum Tree Gang and the Mystery at Mount Tamborine

Krystal, Tracey, Kevin and Matthew must find a way to solve the problem of the closing down of their school convention at Mount Tamborine. Using her detective-like skills, Krystal finds out a secret and shares it with Tracey. The pair must venture on a quest to find out more, and who is behind a plot to shut them down.
Facing opposition and a dangerous venture into unknown areas that are now out of bounds, the pair will manage to find out some information but unfortunately there are crooks around to stop them.
It is up to Kevin and Matthew to find their sisters and look for clues. Going down into dark places is not much fun, but these pair are braver than a mouse facing ten cats! Will they find their sisters in time, and what has happened while they are thinking about the problem? Who can they trust? Their teacher seems a bit odd...and their friends think they are stupid.
Their quest will take them deep into an amazing place where they will meet strange characters and need to be very brave and try to stay calm and find help before it is too late and their parents have a fit!