Milo lives on board the Quip - a magical train that uses the power of imagination to travel through both Story and the real world. The train is owned by Milo's uncle, Horatio. When Horatio takes on a dangerous new job, he needs the help of Tilly Pages. But when poisoned copies of The Wizard of Oz are sent to Horatio and Tilly's grandfather, Milo and Tilly find themselves racing against time to save them... 8+ Fourth in the bestselling bookwandering series!