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A war-torn dieselpunk universe…

Twins are born to a noble family — Mathilde and Giselle, the Sisters Grey. For centuries, the Greys have protected the ruler of Mitteleuropa, but this is a different time — it is the dawn of the Industrial Age and 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.