The Musketeers, and D'Artagnan, receive a new mission when a Very Important Visitor arrives in Paris from England. They learn that sometimes the greatest danger comes from both the most obvious and yet least likely of places.
Three friends are on a school trip to France, one is extremely nervous, one has no interest in the trip whatsoever, except to maybe write about it, and the last is just trying to keep it together, having to deal with the other two. Paris, Paris is the city they chose to visit.