Tome of Fable: Dragon Dusk Book 4 (Dragon Shifter Romance) - Dragon Dusk, #4

Questions linger in Christine's mind, questions that involve the dragon shifter whom she's come to love.  Tristan's fate is shrouded in shadows, and she begins to suspect that her own future is tied to his. Those questions have to wait, however, when Tristan's well-guarded estate is infiltrated by the mysterious woman Christine has seen only from afar.  A tome is stolen, but more than that is a curse placed upon Christine, one that threatens her very soul. Now to save herself and free Tristan from his dark fate, Christine must face one final test against the foe who has lurked in the shadows ever since her adventure began.  Their lives, and the future of her new world, hang in the balance, and one small slip will mean the end for all of them.