The President's Vampire [Book]

For 140 years, Nathaniel Cade has been the President's Vampire, sworn by a blood oath to protect the President and America from their supernatural enemies. Cade's existence is the most closely guarded of the White house secrets: a superhuman convert agent who is the last of line of defence against nightmarescenarios that odinary citzens can only dream of. When a new outbreak of an ancient evil - one that Cade has seen before - comes to light, he and his human handler, Zach Barrows, must track down its source.

-- back cover.