The title sums up the whole movie well - it's an action horror with American history as you've never seen it before.
In the opening, the late-President announces "history prefers legends to men" - but as we know, books don't tell the whole truth.
We meet Abraham Lincoln as ayoung boy, protecting his African-American friend from the whip of the Lincoln family's nasty slave-trading boss, Jack Barts.
This triggers a chain of events when Abe later witnesses Barts' killing of his mother and vows revenge.
Years later, when a grown-up Abe attempts to kill Barts, he discovers he's actually a vampire.