Because of the escapades of Alexis, the Crown Prince of Vodenia, the kingdom is likely to lose the loan lent to them by a rich foreign banker. Baron Patcheff, a minister, decides then to replace the Prince by a double. The man chosen is Castin, a Parisian haberdasher, who looks like Alexis feature for feature.
Inflamed by his readings of chivalric novels, Don Quixote, a knight with a sad face, accompanied by Sancho Panza, a peasant steeped in common sense, decides to set off across the world in search of improbable adventures.
A night watchman on the Eiffel Tower wakes up to find the entire population of the city frozen in place.