Time is fracturing. History is vanishing. And the future is running out. In the year 2147, Lyra Blackwood is the Chrona-the sole guardian of the space-time continuum. Her duty is to keep history intact, but when a chilling message arrives from the past, everything changes. In 1899 London, key historical figures are disappearing. Wilhelm II of Prussia has been assassinated decades before his time, and the murders are accelerating. If the timeline continues to unravel, the past will collide with the future, destroying everything. Lyra must travel back to a world of gaslit streets and hidden agendas to uncover who-or what-is rewriting history. Her only ally is Alistair Warden, the enigmatic Aether, stranded without the technology he needs to fight back. But even he may be hiding more than he reveals. Time is no longer on their side. As the clock ticks down, Lyra must face a dangerous truth: to save the future, she may have to break the very rules she was sworn to protect. The past can't be rewritten. Or can it?