It centers on three main characters: Nathaniel Cade, a vampire more than 160 years old, currently bound by a blood oath to serve and protect the President of the United States; former Federal Bureau of Investigation Agent William Griffin, or "Griff," Cade's handler for more than 30 years, and Zach Barrows, a former White House staffer that is Griff's replacement.
Farnsworth has stated that the idea behind this book came from the strange story of President Andrew Johnson's pardon of a man accused of being a vampire,[1] as related by Robert Damon Schneck and Charles Fort.
A mysterious operative is then brought before the Serbian pack's leader and attempts to bargain with them for a metal box marked with US Army stencils that was stolen in rioting at the country's embassy.
One of the soldiers, veteran sniper Specialist Wayne Denton, witnesses the unusual operative suddenly react inhumanly fast and strong and proceeds to systematically kill them all, expertly and withstanding no injuries.
Twenty hours later, political operative Zachary Taylor "Zach" Barrows is escorted by Special Agent William Hawley "Griff" Griffin to the Smithsonian Institution directly from a meeting with Samuel Curtis, the President of the United States, at the White House.
Upon arrival and entrance to the Smithsonian's oldest area, Griff brings Zach into the "Reliquary"; a hidden base containing relics (e.g. skeletal remains, robot pieces, crystal skulls, stone tablets, carved idols etc.)
Nearing retirement, Zach has been chosen to succeed Griff, as President Curtis considers him loyal and a member of his inner circle who can be trusted to be "in the knowledge" about Cade.
To ensure his loyalty and obedience, Johnson brought voodoo queen Marie Laveau to bind Cade to the orders of him and his successors, and protect and serve the United States for as long as he existed.
Laveau explains that, because of his actions and his new nature, Cade is damned - God will not receive him and Heaven has no place for him, despite his Christian faith, and he has no chance of redemption.
ICE agents have found a shipping container holding a grim discovery: various body parts all from deceased U.S. soldiers, all hanging on hooks in a meat locker.
His Elixir can bring dead tissue to life, and make it so strong just one of his creations killed dozens of people before being stopped.
Konrad is knowingly breaking his word to the U.S. government, as he seeks to destroy America in revenge for the destruction of Third Reich in World War II.
Despite impressive fighting skills and inhuman tolerance, Cade very nearly dies while destroying three of the zombies - Zach saves his life and earns some measure of his respect.
However, the zombie's original human consciousness, a deceased U.S. marine corporal, becomes aware enough of what's happening and recognises the president, and is able to stop himself from killing him.
Self-control/sacrifice: Cade is unique in vampires in that he refuses, in spite of agonizing pain and wild desire, to drink human blood.
This constant struggle has been described by Farnsworth as stemming from Cade being raised Calvinist, with a strong belief in predestination and the damnation of most of humanity.,[1] He also objects when those around him blaspheme by using the Lord's name in vain, and wears a worn cross around his neck, despite its physical discomfort.
"[1] In The Washington Post, Elizabeth Hand praised Blood Oath as an "irresistible page-turner", and noted that it used the same themes as The Manchurian Candidate and Invasion of the Body Snatchers.
[7] Farnsworth, who will have an executive producer credit for the film, has not had much to say about the production other than his great desire to have Christian Bale in the title role of Cade and Justin Long filling in for Zach.
)"[1] Farnsworth has recently released book three, titled Red, White and Blood, and states that he would like to continue Cade's adventures for quite some time.