The President of the United States, William Sheridan, is found assassinated. A stranger is discovered on a beach, hurt by a bullet in his head and wearing number XIII tattooed on his left collarbone. Amnesic, he’s designated as President Sheridan’s murderer. He found out that high civilian and military authorities are interested in him. Tracked, manipulated, he’ll need to discover his identity and his past, and find out what is going on while escaping the killers on his trail and the conspiracy of the XX…