From Publishers Weekly

This action-filled debut by scriptwriter Farnsworth reads like a cross between P.N. Elrod's historical vampire adventures and Thomas Greanias's conspiracy thrillers. Nathaniel Cade, the president's vampire, swore to fight on the side of President Andrew Jackson and all his successors. In the present day, Zach Barrows, a rising political star caught canoodling with the president's daughter, suddenly finds himself training to be Cade's handler after tough, wise special agent William Griffin retires. As they try to stop Cade's old nemesis, Dr. Johann Konrad, from creating an army of Frankensteinian monster soldiers, they uncover a deeper government conspiracy. Entertainingly plausible historical documents at the beginning of each chapter and a sense that this fight is just a skirmish in a larger war help elevate the book above its sometimes bland characters and their predictable motivations. (May)
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From Bookmarks Magazine

Since the undead seem to be turning up in every conceivable medium (TV, books, film) and genre (_Pride and Prejudice and Zombies _or Abraham Lincoln: Vampire Hunter, anyone?), critics were not exactly surprised to see a novel about "the President's vampire." But overall they felt that Farnsworth handles his material with flair. A common compliment and complaint was that the book reads like a screenplay, which is no surprise, given Farnsworth's background. But even those critics who griped about the occasional movie cliché found Blood Oath entertaining fun. But if you're not a fan of the vampire novels recently populating the shelves, well, here's another to move past.