The fifth and penultimate book in the modern-classic and bestselling bookwandering series for readers aged eight to twelve. As Tilly and Milo hurtle towards their final showdown with the Alchemist, the stakes are higher than ever – though there is always time for a hot chocolate! With his uncle Horatio trapped in an enchanted sleep, Milo Bolt is now the Driver of the Quip – a train that can travel anywhere you can imagine. As the Alchemist goes to greater and greater lengths to take control of all of bookwandering, Milo leaves Tilly at Pages & Co. and heads off with new friend Alessia to try and save them all. Their journey takes them to the magical treehouse home of the Botanist, the arch-rival of the Alchemist and an expert in imagination. The search for a cure for Horatio leads them to stories more strange and dangerous than they’ve been to before, from the walls of the Secret Garden to facing off against the Jabberwocky. Meanwhile the Alchemist will stop at nothing to find the book that holds all the secrets of bookwandering, and the key to opening it. The children find themselves in a desperate race against time as the entire world of imagination is under threat. What they discover will set in motion the final battle for the fate of bookwandering…