The Patient at Tonesburry Manor — Elizabeth Kellier

Christine Kent went to the gloomy Tonesburry Manor as the special nurse to its ailing mistress, the eccentric old Mrs. Mallstead. But the gloom seemed to lighten when she discovered that her patient had two handsome nephews living there, with one of whom she fell suddenly in love.
Yet when it turned out that Mrs. Mallstead had been playing a deadly cat-and-mouse game with her two young heirs, it was not long before the pretty nurse found herself the new storm center of that family conflict--fighting to save her new romance as well as to live up to her medical duty.