Suzy can't wait to return to the Union of Impossible Places on the Impossible Postal Express. But when she arrives, she overhears a dastardly plan to destroy Trollville from a shadowy and unexpected villain. Suzy and her friends must race from magical cloud-worlds to secret caverns to catch the culprit, before Trollville comes crashing down…

Shortlisted for the Waterstones Children's Book Prize 2019.

"Great fun!" - Philip Reeve, author of Mortal Engines

"Rip-roaring inventive adventure" - The Independent

When Suzy hears a strange noise in the middle of the night, she creeps downstairs to find a train roaring through her house. But this is no ordinary train. This is the magical delivery express for the Union of Impossible Places.

Whisked on board by a troll-boy, Suzy's world is turned upside down when she's asked to deliver a cursed package to a fearsome sorceress. And quite suddenly, Suzy realizes the fate of the Impossible Places is in her hands...

Suzy can't wait to return to the Union of Impossible Places on the Impossible Postal Express. But when she arrives, she overhears a dastardly plan to destroy Trollville from a shadowy and unexpected villain. Suzy and her friends must race from magical cloud-worlds to secret caverns to catch the culprit, before Trollville comes crashing down...

Suzy is surprised to find a grumpy troll building a railway through her house - especially when a gigantic steam train crashes into her hallway! This is the Impossible Postal Express, the trusty delivery service of the Union of Impossible Places, and Suzy becomes its newest recruit. And with her cursed first package, an Impossible adventure begins. Welcome to the Impossible Places Where there's fuzzics not physics, where adventure meets magic and where the journey will never, ever take you where you expect it to.

Eleven-year-old Suzy Smith knows exactly how the world works. That's science, and Suzy's good at science. But when she wakes in the middle of the night to find a troll building train tracks through her living room, defying all the laws of space and physics, Suzy's world is turned upside down. How is any of this possible? As the trolls explain, it's "fuzzics," which is like physics only fuzzier! Well Suzy has no choice but to sneak on board and wrangle herself a position on the Impossible Postal service, a train that delivers to impossible places-everywhere from ocean-bottom shipwrecks to Trollville to space! Then, on Suzy's very first delivery-to the evil Lady Crepuscula of the Obsidian tower-the package itself begs not to be delivered. A talking snow globe claiming to be a prince, Frederick promises that the fate of the entire Union of Impossible Places now rests on Suzy's shoulders. But protecting Frederick may mean lying to and even endangering her friend and colleague, the postmaster Wilmot. Can Suzy save her friends and the entire Union of Impossible Places-all while upholding her duties as deputy postmaster?