Children of the NightDan Simmons
Winner of the Locus Award (1993).
In a desolate orphanage in what remains of post-Communist Romania, a desperately ill infant is given the wrong blood transfusion – and flourishes when he's supposed to die. The discovery of his unique immune system may hold the key to the long-awaited cure for cancer and AIDS.
For a dedicated American doctor, he promises the medical breakthrough of a lifetime, as well as a very special love she's never been able to find. But he also conceals a shockingly intimate link to a clan of vampires and their legendary leader – the fiend the world calls Vlad Dracula, who, for centuries, has triumphed over countless rival tyrants, including death itself...
Dan Simmons (born April 4, 1948) is an American science fiction and horror writer. He is the author of the Hyperion Cantos and the Ilium/Olympos cycles, among other works which span the science fiction, horror, and fantasy genres, sometimes within a single novel.