The country is still in shock after the assassination of President Sheridan. You wake up wounded, without any memory, on a deserted beach of the west coast. The only clues to your identity are the number XIII tattooed near your collarbone and a locker key. Despite your amnesia, you discover that you have the reflexes of a fully trained professional fighter. You take the road seeking for pieces of your past, finding out that you played a role in the murder of the President of the United States and uncovering the most horrific conspiracy in the entire history of the country.