The fourth book in the series "Invasion (Conqueror)", which takes place in Roman Britain, 44 AD In the winter of A.D. 44, Rome's plan to restore a friendly ruler in Britain's most hostile area faced a new threat. There are rumors of a traitor close to the king, and a new enemy is gaining strength behind the swamps. While the ruler continues to implement his plans for the romanization of his subjects, Horace Figul, a junior officer of the Second Legion, is instructed to train native bodyguards. But when the Roman army falls into a trap, a secret sect of Druids seizes power and takes the ruler hostage. Now Figul must infiltrate the enemy ranks, free the ruler and hunt down the elusive leader of the Druids before the whole of Britain plunges into bloody chaos.