"Abraham Lincoln: Vampire Hunter" is a novel written by Seth Grahame-Smith that combines historical fiction with supernatural elements. It presents an alternate history where Abraham Lincoln, the 16th President of the United States, secretly battles vampires who are responsible for the oppression of humanity, particularly during the era of slavery. The book explores Lincoln's life from his childhood to his presidency, intertwining real events with the fictional vampire narrative. It highlights themes of morality, power, and the struggle for freedom, while also providing a unique perspective on the American Civil War and the fight against slavery.