It's the end of the 12th century. The young pious Robert Narra (Eric Stoltz) sets out to join The Third Crusade with King Richard the Lionheart. On route, he runs away from a battle. He encounters two escaped performers/thieves Michael (Dexter Fletcher) and his sister Mathilda (Deborah Moore). Michael would like to go to Paris. They seek shelter at a monastery where they're told about The Black Prince (Gabriel Byrne) who captures and sells children to the Muslims. The Black Prince is a disillusioned former crusader. In Paris, they are captured by the orphans of the Underground City. The Black Prince kills the mayor of the Underground City and plans to capture the army of orphans as they go off to join the crusade.
The Children's Crusade is not a happy story. The problem is that the goal is not well conceived. In order for this to work for a modern audience, they need to find a nicer place for them to strive for. I don't know why anybody would root for the kids to get to the crusade. Also this doesn't feel real enough to be gritty or fanciful enough to be magical. It operates in a weird middle ground where neither is satisfied. Jerry Goldsmith brings an epic score to this not-so epic movie.