In 17th century France, a young and ambitious D'Artagnan leaves his home in the provinces to join the King's Musketeers in Paris. Upon his arrival, he inadvertently offends the legendary trio of musketeers – Athos, Porthos, and Aramis. Despite their rocky start resulting in a planned double duel, they soon become allies when faced with the threat of Cardinal Richelieu's guards. D'Artagnan's bravery and quick wit impress the musketeers, and he quickly earns a place among them. The group is soon tasked with protecting Queen Anne from a nefarious plot orchestrated by Richelieu, aimed at exposing her alleged indiscretions and discrediting her in the eyes of King Louis XIII.

As they delve deeper into the intrigue, they uncover a tangled web involving treacherous betrayals and political maneuverings. Entangled in these schemes is the alluring and manipulative Milady de Winter, who has her own agenda. While maintaining their loyalty to each other and to the Queen, D'Artagnan and his newfound comrades navigate a series of perilous adventures. Their mission becomes increasingly dire as they are embroiled in a quest to prevent the destruction of the monarchy itself. Facing dangers at every turn, the musketeers' skills and unity are tested, as is D'Artagnan's resolve to uphold honor above all else.