After young Henry Babbitt tragically loses his father, he can't help but remember the promises of the great adventures they would now never take. Then, on a snowy Christmas Eve, his grandfather reveals that he's tracked down a series of mysterious century-old clues left by Hunter S. Skavenger, the eccentric magnate who launched the first and greatest scavenger hunt.

Hours later, on Christmas Day, Henry finds himself magically transported back to 1885, where he teams up with a ragtag band of youngsters in a quest to solve Skavenger's elaborate puzzle. From New York to the Mississippi riverboats to the streets of old Paris, Henry and his new friends face off not only against brilliant competing teams, but also Skavenger's own dark and elusive nemesis: Hiram Doubt.