Professor von Volt has made an amazing discovery – the location of the fa-mouse 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? About the Geronimo Stilton series: Geronimo Stilton is a bestselling children’s series with a dedicated international fan base. As seen on Netflix, the series follows the adventures of the Geronimo Stilton the fa-mouse journalist, as he searches for the next hot scoop. With illustrations and fun fonts throughout, Geronimo Stilton is perfect for reluctant readers aged 5+ years.