The Legacy of Caliban echoes down through the ages, and the secretive mission of the Dark Angels continues: to atone for the sins of their forefathers and capture all of the renegades and heretics known as the Fallen. With the most famous of these Fallen Dark Angels the elusive Cypher now firmly in their grasp after his unexpected surrender, the Dark Angels are given fresh hope that they can redeem themselves in the eyes of the Emperor. But what game is Cypher playing? What plans does he have? And can the Dark Angels ever really atone, or will they always remain the Unforgiven?

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Gav Thorpe’s epic tale of the Dark Angels comes to an explosive conclusion. The arch-Fallen, Cypher, is in the Dark Angels’ hands, and Supreme Grand Master learns some secrets that will change the Chapter. And when the Death Guard attack the Rock, Azrael is forced to make a decision that will echo all the way back to the Horus Heresy and into the future.