I mainly watched The Three Musketeers: Milady (2023) for completeness sake. It's a sequel, and I wasn't completely sold by the first entry. WAs this one better, or was I just in the right mood.
It starts where the last one left off: Constance (Luna Khoudri) has been kidnapped and D'Artagnan (Francois Civil) knocked out. He wakes up, captive of Gaston, the King's younger brother and main villain of the piece. He escapes and goes off to search for Constance. He thinks he's found her, but it turns out to be Milady (Eva Green), shackled and chained. She promises that she can help him find Constance, so he breaks her out. Of course, she tries to seduce him, but he stays faithful to his Constance.
After a few more fights, she tries again, literally ripping her bodice off. This time, he doesn't resist as hard - until he sees the fleur de lis branded on her shoulder. He then realizes that she is Athos' treacherous wife, supposedly dead.
Meanwhile, Aramis discovers that his sister, now a nun, is pregnant. He decides that the father is a soldier now fighting at La Rochelle. In fact, many of the characters decide that the next step is towards La Rochelle.
The main thing I liked about this entry is the fights. There were lots of long, no cut, handheld scenes. These were well choreographed as well as well shot. The plots were a bit complex - maybe I need to more versed in French history. But Milady made a great femme fatale, sympathetic until she tried to kill you. Constance is missing from most of the movie, so she's not as much fun.
And if you don't mind a SPOILER, it ends with Athos' son captured. So I guess there is space for a third entry.