A Thunder Warrior, fighting in the gladiatorial pits, is drawn into a deadly battle between two vicious predators – one of them a Custodian Guard. It has been many long years since the fall of the Thunder Warriors. After the last battles of Unity, the legions of genhanced warriors were slaughtered by the Emperor's Custodian Guard on the Master of Mankind's orders. But a handful survived… Now one of the last few Thunder Warriors gets caught up in dangerous events that engulf the Throneworld – even as he is hunted by one of the Emperor's praetorians.