Ex-detective Macmillan has a taste for bad girls, but his last lover really took the cake?and his humanity. Now a half-demon, Mac?s lost his friends, his family, and his job. Then a beguiling vampire asks for his help to find her son. Suddenly, Mac has a case to work?one that leads him deeps into the supernatural prison where Mac learns that cracking the case will cost him his last scrap of humanity.