Betrayed by his superiors and left for dead, XIII has definitely left the secret service in favor of a wandering life. In the hope of finding food and shelter, he went to Empire City and meets Betty Barnowsky, a beautiful activist involved in the fight against the major energy groups. Betty saving a police raid muscled XIII calls within the Veil, an underground organization led by Max Vargas. Veil attempts to expose openly the climate research center Hearpe (High Energy Auroral Refraction Protonospheric Emitter), whose real purpose is to influence the climate for economic reasons. Betty seduced both by itself and by his speech committed XIII agrees to help activists.
XIII is the story of a man's quest to uncover the truth about his identity. Named for the Roman numeral tattooed on his neck, XIII is a former secret operative who cannot remember his past. Hunted by a dark anti-government organization, XIII searches for clues that will lead him to who he is, and to the secret he carries that makes him so valuable - and so potentially dangerous. To gain information, the highly-trained XIII must take on missions from those he cannot trust, including the former President Sheridan, a possible traitor. Complicating matters, XIII is torn between two women: Sam, his friend and ally, and the enigmatic Jones, a Secret Service operative with whom XIII was once involved. Conspiracy, secrets and mistrust: XIII's world is a dangerous place.