Assassin's Creed: The Secret Crusade was the third novel based on the Assassin's Creed series, written by Oliver Bowden and published by Penguin Books. The novel told the story of the Assassin Altaïr Ibn-La'Ahad, narrated by Niccolò Polo, the father of the famed explorer, Marco Polo. During Altaïr's life, the book showed events from a third person perspective, but then changed to a first person perspective when Niccolò narrated his own life.