Welcome to the Devil’s house.

A nest of vipers dwells within.

And a trail of blood leads to the Borgia Palace ...

Against a teeming canvas of Borgia politics, Niccolò Machiavelli and Leonardo da Vinci come together to unmask a serial killer. Through a labyrinth of ancient superstition and erotic obsession they discover an evil and terrible secret – one that still lies buried in the lines of Machiavelli’s greatest work, The Prince.