When the musketeers bring in their laundry, Siroc finds by accident a scrap of the missing notebook of his inventor-example, Leonardo da Vinci. D'Artagnan is forced to 'defend the honor' against the cardinal's guards captain Bernard of laundry girl Mireille, an airhead which has a crush on him. After the captain informs cardinal Mazarin, they torture her father, farmer Huppert, to force him to hand over the pages he found in a field before convening a meeting of the knights of the black tabernacle. There the cardinal announces it contains plans for an invincible weapon to seize control of Europe, which can alas only be built by a genius- he chooses Siroc, but offering him a de-luxe laboratory and research budget fail. The knights also try to counter the musketeers' military mission which Duvall entrusted to D'Artagnan and Zak: escorting a royal gold transport to Louis's favorite cousin François de Mignon, to fight off his brother Armand's claims to the family castle, which Mazarin wants for his cahoot because of its strategic position. Meanwhile 'Jacques' insists to side with 'poor neglected' Mireille, and gets her just deserts: the fickle nincompoop turns her romantic infatuation on 'him', at once expecting marriage. Fed the crucial notebook page by Huppert, Siroc constructs what proves a machine gun (Western style) and immediately wants to destroy it, but the order knights appear and take Mireille hostage.
—KGF Vissers