Harrison Beck enthusiastically receives his uncle Nathaniel's gift for his twelfth birthday, which is none other than an unforgettable journey on the California Comet train, which makes the iconic Chicago - San Francisco route.

After the press conference given by a billionaire train enthusiast in his private carriage, his daughter disappears. Everything indicates that it is a kidnapping and Harrison will have to do his best to quickly find the girl and uncover the culprits. Courage, observance, the detailed sketches he makes, as well as two new friends with a knack for magic tricks, are enough to solve the mystery before the end of the journey;