Outlaw Gulch

From publisher blurb: You are in boarding school, and your roommate is the Crown Prince of Aggar. He has vanished without a trace, and it's up to you to find him. All the clues indicate that he's headed west. But the year is 1892, and the Wild West is frontier territory, full of dangerous outlaws, gold prospectors, and Indian tribes. Your friend could be anywhere, should you look first?