On countless savage battlefields across the breadth of the Imperium, the stalwart servants of the Imperium wage a bloody war against the myriad alien creatures that would see mankind exterminated. They are the ork, the eldar, the tyranids and far, far worse. The last line of defence against these foul xenos is the Deathwatch - an elite cadre of alien hunters drawn from the ranks of the Space Marines. Now an elite team of the Deathwatch under the command of Jerron, an Ultramarine veteran has been sent to quell an alien insurrection on the Imperial planet of Pavia. But when the aliens have infiltrated Imperial society and appear to be human, the team must mark their targets carefully!