The temple of the ruby of fire. In Geronimo Stilton's most thrilling adventure yet, his old friend Professor von Volt has discovered the location of the famous Ruby of Fire. The jewel is protected by thousands of ancient booby-traps -- a 'fraidy mouse's worst nightmare! Will Geronimo make it through with his fur? The phantom of the subway. When Geronimo Stilton's sister tells him a ghost was haunting New Mouse City's subway tunnels, he had to get the scoop. So he sets off with Thea, Trap, and his assistant editor Pinky Pick. But they were all in for the fright of their wee mouse lives because the ghost turned out to be a cat!