New York, 1855. Lucky Luke is escorting the Dalton brothers to their proces. Obviously, the horrible brothers escape from Lucky Luke and rob the numerous banks of the Big Apple. Joe Dalton hides the money in a truck because the police is trying to stop them and bring them back to Lucky Luke. The truck is part of a caravan of immigrants, led by Lucky Luke, leaving for California. The Dalton brothers have no choice but to stay with Lucky Luke and the caravan…