He has many names: Lord of Clones, Flenser, Progenitor. He, insidious and depraved, brings fear to people and monsters. Former Chief Apothecary of the Emperor's Children, the madman known as Fabius Bile has unparalleled knowledge of genetic transformation. Now he is one of the most famous renegades. Those once called brothers hate him, and even the most debased Chaos Space Marines fear the mere sound of his name. Once exiled for his terrible experiments, Bile disappeared into the depths of the Eye of Terror, leaving behind the results of his work - disgusting monsters. But when a former student brings news of a most valuable ship that is just waiting for an invader, Bile, unable to resist, again rushes into the crucible of war. Having acquired this ship, he may find the key to the only riddle that has so far eluded him... A riddle that can save him from certain death.