Professor von Volt has made an amazing discovery the location of the famouse Fire Ruby! Before Geronimo knows it, Thea's dragged him on a frantic race to find it. But will they make it past ancient booby traps to reach the legendary gem before anyone else? The series is perfect for 5 to 8 year old's both avid and reluctant readers due to its expressive typeset, fun illustrations and humorous stories.
