The Dragon's eye

Step into the world of the Secret and Ancient Society of Dragonolists in this series of fire-breathing adventures.
In The Dragon's Eye join twelve-year-old Daniel Cook and his sister Beatrice as they begin their dragonological apprenticeship under the wathcful eye of the eccentric Dr. Ernest Drake.
Soon their studies are interrupted when they find themselves caught up in a race against time. Can they solve the riddle to discover the whereabouts of the fabled Dragon's Eye gem?
Most importantly, can the ambitious siblings (with the help of some friendly dragons) save it from falling into the hands of Drake's arch rival, the evil Ignatius Crook? The fate of all dragons rests in their hands...