13-year-old Tulip finds herself on a mysterious train with an endless number of cars, each one its own universe, and must find a way to get home.

Mirror Tulip (M.T.), the mirror version of Tulip first seen in Book One's "The Chrome Car," wanders the train both to avoid the Mirror Police and to...

Grace and Simon are the leaders of the Apex, an anarchic group of kids who believe they are entitled to the train. During one of their destructive...

Childhood friends with opposing personalities, Mingi and Ryan, dream of becoming rock stars but find themselves on the Infinity Train. They explore...

The kids of The Apex raid a musical car before descending on a village of unsuspecting turtles - but before they can complete their mission, leaders...

Grace and Simon look on the bright side and hope that this will be like a mini-vacation from their responsibilities as leaders of The Apex.

The gang's uneasy alliance is tested by a challenge in their first car together: dancing in a high-stakes octopus debutante ball!

Stuck in a blizzard, the gang seeks shelter in a nearby cabin. But when Simon realizes who's inside, he frantically searches for a way out.

A giant, color-changing clock creates a shifting-maze puzzle that the gang has to solve before they can leave the car.

The Apex are just a car away! They're almost home! But first they have to make it through a forest full of pinecone camp counselors.

The gang finds themselves in a car full of golden winged snakes, but in that dusty landscape a mystery they're unprepared for awaits them.

In the seemingly innocent Hey Ho Whoa car, a shocking revelation rocks Grace and Simon's world. Will they be able to fix it before The Apex find out?

The gang is finally ready to meet The Apex again, but keeping secrets has consequences.

The gang reorders The Apex, but what will the new order be?