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Tulip has to face her past.
Tulip, Atticus and One-One enter a crystal forest car and have to take part in a musical ritual.
The gang enters an unfinished train car and tries to fix it.
Book One follows Tulip, a headstrong 13-year-old girl, who must use her wits to uncover the train's many secrets - and hopefully return home. Tulip's mind-bending journey will find her forging friendships with One-One, a robot with dueling personalities, and Atticus, the canine king of Corginia. But with new surprises awaiting in every car, will Tulip ever find a way off the train?
