What it says on the tin, no kidding. You thought old Abe was just the guy in the beard and the stovepipe hat who vanquished the Confederacy and put an end to slavery.
Now we learn that as a young man (Benjamin Walker) under the supervision of Henry Sturgess (Dominic Cooper), the President wielded a silver axe to slay vampires everywhere, having vowed revenge on the bloodsucker (Marton Csokas) who killed his mom.
To say that liberties are taken is putting it mildly: vampires also crop up at the battle of Gettysburg, while big-chief vamp Rufus Sewell plots the annexation of the US.
It's all surpassingly silly, adapted from his own novel by Seth Grahame-Smith, whose previous book, Pride and Prejudice and Zombies, suggests a compulsion to regard nothing as sacred.