When aliens invade, the Royal Fleet rallies to defend the outer planets of the Solar System. Dana D'Artagnan digs deeper into a web of court politics and royal intrigue, desperate to unlock the secrets of a dangerously attractive spy who wears the face of a dead man.

With Athos, Porthos and Aramis fighting on the front line of a space war, Dana will make any sacrifice she can to be at their side and protect the royal family ? and the Solar System ? from Milord's murderous machinations.

All Dana ever wanted was to be a Musketeer. Now all she wants is to save them.