Lady Vengeance — Melinda Hammond

When Madame Elinor de Sange returns to England in 1753, bent on revenge, Guy Morellon, Marquis of Thurleigh finds himself pitted against a dangerous adversary. For Elinor has the bloodstone, a fiery ruby that holds the key to his destruction and that of the other men who ruined her life eight years earlier. But revenge carries a high price, and Elinor must learn to trust -- and to forgive. Historical Romantic Adventure by Melinda Hammond; originally published be Robert Hale [UK]