The Secret of the Stone

When Olive and her friends find a mysterious stone and discover it grants wishes, they think their lives are made. Sure, they're going to save the world and all that stuff, but there are a few fun things they want to do first. Then they realise other people are looking for the stone. People who will stop at nothing to get it ... As the stakes become more dangerous, secrets are kept, loyalties are questioned, and promises are broken.