The country is shocked after the assassination of President Sheridan. You wake up, wounded and with amnesia, on a lonely beach on the east coast. The only clues to your identity are a tattoo with the number XIII near your collarbone and a key to a locker. Despite having no memories, you discover that you have the reflexes of a highly trained, professional fighter. You set out to find your past, discovering that you played a role in the assassination of the President of the United States and uncovering the most impressive conspiracy ever implemented in the country's history.