Set in the same period as his best-known novel, Alexandre Dumas’s “forgotten masterpiece” (Le Monde) features two steely and preternaturally modern heroines fighting on opposite sides of the wars that ravaged seventeenth-century France. An unabashed page-turner, humorous, dramatic, and crackling with panache, this new English translation—the first in more than 100 years—shows Dumas at the peak of his powers.