By request of Van Voytz and on his own free will, Colonel-Commissar Gaunt leads a hand-picked team of Ghosts to Gereon; a Chaos-held world where Sturm is undergoing an agonising ordeal to recover his memory. The insertion team is tasked with killing Sturm to prevent him from yielding critical intelligence that would endanger the Crusade war effort. The group links up with the loyalist resistance on Gereon to locate Sturm and evade the heretical forces pursuing them. With countless fanatical soldiers and foul warp-beings standing between the rescue team and their target, Gaunt and his men must not only fight for their lives, but also resist the corruption of Chaos that threatens to overwhelm them.