"The conspirators; or, The chevalier d'Harmental" by Alexandre Dumas and Auguste Maquet is a novel published in 1843. Set in 1718 France, the story revolves around a dangerous conspiracy against the regency of Philippe d'Orléans, who governs during young Louis XV's infancy. This collaboration between Dumas and Maquet launched a prolific partnership that would produce eighteen novels together. Critics have ranked it among Dumas's masterpieces, with his biographer calling it the finest of his works set during Louis XV's reign. (This is an automatically generated summary.)