To a noble family twins are born; Mathilde and Giselle, the Sisters Grey. For centuries the Greys have protected the Kaiser, ruler of Mitteleuropa - but this is a different time. At the dawn of the Industrial Age a great war rages. When the Kaiser is found dead Giselle is accused of his murder. Pursued by her sisters and hunted by the enemy, Giselle must unravel the prophecy of the Carbon Grey before history itself is rewritten. "Carbon Grey Volume 1: Sisters at War" includes all three issues of the sold-out first arc, plus deleted scenes, concept art, and additional new content.