Some strange burglaries take place at each performance of the play "The Dashing White Cowboy" given by the company of W. Baltimore. Simply coincidence? Suspicious, Lucky Luke follows them. Unfortunately, it's he who is accused of theft in every city the actors pass through. After all, he's also a stranger. But despite this series of arrests, Lucky Luke won't let Baltimore and his troupe leave him behind, and he'll clear his name...