The Three Musketeers (Les Trois Mousquetaires) is a novel by Alexandre Dumas. The novel recounts the adventures of a young poor man named d'Artagnan from Gascony, who leaves his home town to make money in Paris. But, he always seems to be looking for trouble, and on his way to Paris, he gets robbed and his possessions stolen.
Misfortunes continue when he offends and gets challenged to a duel by each of three musketeers (Athos, Aramis and Porthos). But, when the guards threaten them and asked to stop dueling, they unite and escape. And so start the adventures of the d'Artagnan and the Three Musketeers.
The story of d'Artagnan is continued in Twenty Years After and The Vicomte of Bragelonne: Ten Years Later. Despite the titles, Twenty Years After comes actually before the latter in the series. Those three novels by Dumas are together known as the d'Artagnan Romances.
The Three Musketeers have never fallen out of popularity since they were published.