Some strange burglaries take place at each performance of the play The Dashing White Cowboy'. Is it simply co-incidence? A suspicious Lucky Luke follows the crime, but unfortunately it's he who is accused of theft in each city the actors pass through. After all, he's also a stranger, but despite this series of arrests, Lucky Luke won't let the troupe leave him behind, and he's more determined than ever to clear his name and catch the culprit.'