Following Treville's funeral the musketeers survive an attempt by Grimaud to kill them when their garrison is torched, leaving many casualties, and gunpowder and weapons stolen. To lure the musketeers into a trap Grimaud takes hostages including Sylvie but the four comrades stage a rescue, and the queen and Dauphin are restored to the palace with Milady as the royal spy master, her first task being to take care of Gaston. However, the mortally wounded Grimaud escapes and the musketeers must stop him from blowing up the city with the stolen gunpowder.

Milady seeks her revenge against the Musketeers. Will the Musketeers outwit her or will she destroy them by manipulating their weakest link, D'Artagnan?

The Musketeers must risk everything to save France from Rochefort's treacherous plan.

The Musketeers come under siege in a convent whilst protecting the queen's life.

When death strikes the Louvre, Treville takes controversial steps to protect the Dauphin from the unholy alliance of Grimaud, Gaston and the Duke of Lorraine. His secretive tactics isolate the Queen and threaten to drive even his loyal Musketeers apart.

The Musketeers must put their lives on the line when the queen is accused of treason.

A contest between the Musketeers and Red Guards gives D'Artagnan a chance to prove himself.

It's the day of reckoning, as Grimaud vows to kill the Musketeers in a series of savage co-ordinated attacks and puts Feron to the ultimate test in his bid for power. The furious battle for survival sparks a series of revelations that threaten to destroy Paris. Before the day is out, a hero falls, there’s a traitor on the rise and the Musketeers will be changed forever.

Porthos uncovers the truth about his past and questions his allegiance to the Musketeers.

The Musketeers help rescue an enemy's daughter in exchange for a deadly gunpowder formula.

The corrupt Governor of Paris conspires with the Duke de Beaufort, primary provider of food for Paris, to stage a robbery of the city's granary and pin it on the refugees, only to later sell the stolen grain back to the King at an inflated price. D'Artagnan is taken captive along with the rioting refugees, and the other Musketeers (along with D'Artagnan's wife Constance, now in charge of the Musketeer garrison) must rescue them from the hands of the Red Guard before they are executed.

Athos must confront his past to protect the people he left behind.

The Musketeers must rescue a French general from an impenetrable Spanish prison.

The Musketeers must escort a merchant trader back to Paris and thwart his enemies.

A woman claims to have visions from God which instruct her to start a war with Spain.

Athos, Porthos and D'Artagnan are fighting on the battlefront while Aramis has trouble living in contemplation as a monk. The Musketeers' search for missing gunpowder lead them to follow bandits to Aramis' monastery, where circumstance force them to collaborate to save the monastery's children and brothers. Aramis' finally accepts his true calling as a Musketeer and rejoins his brothers-in-arms in Paris.

Porthos wakes up after his drunken birthday celebrations with a dead body next to him. The Musketeers must prove his innocence as he gets sentenced to death.

The King’s cousin is ambushed while under Musketeer escort as she travels from Mantua to Sweden to make a political marriage that will be advantageous to France.