David Baldwin & Margaret Weis 
Dark Heart [EPUB ebook] 
Book I of Dragon’s Disciple

Someone, or something, is rippingthe hearts from living men.Justinian, Lord Sterling, has lived for centuries, serving an ancient entity known only as the Dragon. Immortality is Justin’s reward. But to keep it, he must keep killing. Lt. Sandra Mc Cormick is a dedicated cop, a loner whose job is her refuge from a twisted past. But to keep it, she must stop the killing.Two loners, each stalking the other. Each destined to be the other’s savior–and downfall. For love, unexpected, unstoppable, draws them together. And love is the one vice the Dragon will not allow . . .