Snakes slither and hiss on their train ride.

From its grand entrance by train until breakdown at night, the circus brings wonder and sparkle to town.

Thomas the tank engine finds big footprints, and his friend Percy thinks they are from a monster.

Mae is a little girl, and Bear is a bear, but they are both afraid of trains and traveling to places they do not know, so they put on courage hats; Mae's has bear ears, and Bear's has people ears, and when they meet on the train going through bear country to the city, they take courage in each other's company and soon become friends--and when they arrive they exchange hats, which is a lot like exchanging hearts.

Detective Isaac Bell, working for the Van Dorn Detective Agency in 1907, is sent to stop a man known only as the Wrecker, a criminal who traverses the American West, sabotaging railroads and causing death while building up to what Bell guesses will be a grandiose and devastating act.

"There is a volcano in the new Dinosaur Park. Some engines think it will erupt! What will Thomas do?"--Page 4 of cover.