Headstrong 13-year-old girl Tulip finds herself on a mysterious train where every carriage contains its own universe, and must find her way home.

Tulip strikes a deal with a cat in an attempt to get home, but is not sure if the price is worth the cost.

Tulip and One-One explore a carriage full of Corgis and must find a way to fight against a mysterious monster.

Tulip, Atticus and One-One enter a crystal forest carriage and realise that they must take part in a musical ritual.

The gang encounters the Cat who reveals that she has a tape with Tulip's name on it, which forces Tulip to face her past.

The gang enters an unfinished train carriage that contains houses without walls and turtle people. They try to fix the car to help fix the universe.