Anyone interested in Vampires and such should check out Brian Lumley and his Necroscope Series, very, very good. Here is a LINK to Brian's site and pages regarding the Necroscope series. Cold war Spies, History, ESP and just about anything else you can think of is covered in his series. Had me enthralled from the first paragraph and through-out the series, brilliantly written and well crafted.
Harry Keogh. To use an old adage, "the man, the myth, the legend."
Spanning thirteen volumes, Harry is intertwined in every one, whether it be as himself, his sons, or even Alec Kyle. You can't forget him, nor do you want to. Have some time to kill? Jump through a doorway into the vast world of the Necroscope. Oops...I haven't even mentioned the Wamphyri...but you'll find out about them soon enough.