The Ancient Order of the Red Cross of Gold is set upon by unexplained forces as the alchemist and assassin, Chevalier Mark Ramsay, learns a powerful lesson about physical alchemy when he unexpectedly 'gives birth' to the mythical Philosopher's Stone. The arrival of the Stone sets off a chain of events prophesied in a number of obscure alchemical texts in which he and his Brothers play pivotal roles. The Stone, coveted by many, understood by few, is stolen and held for ransom by a renegade ex-Templar. His bumbling disregard for the Templar Code catches the attention of an even more terrifying old enemy.

Mark Ramsay, Chevalier du Morte, for the Order of the Red Cross of Gold has double duty as the Order's assassin and alchemist and double trouble when he is abducted by unscrupulous persons wishing to extract the Order's secret of immortality from him. He finds love in an unexpected place and almost loses his status, his honor and his life as his Brothers of the Order set out to bring him home, alive or dead. He must outwit his kidnappers, save his maiden in distress and fight off members of his own Order before he can go home, but he must choose between his new found love and the Order he has served for over 800 years.

Mark Ramsay returns to America bent on marrying the girl he left behind, but things are not well on the home front. Two members of his ancient Order set themselves on a dangerous course to stop him at all costs, believing that the marriage will cause the dissolution of the Order. However, his worst enemy lies much closer to his heart when his most beloved Brother weighs into the equation on the wrong side. The Knight of Death places everything on the line as he battles to save the life of his son and win back the woman he loves.