An explosion has split Time and Archer has paid the ultimate price, leaving Saira heartbroken and desperate to repair the rupture. But the blast has trapped Saira in an alternate future where Mongers are cornered predators and Death is the ultimate judge. If Saira and her larcenous friend Ringo ever want to see Archer alive, they must pull off the impossible - alter history at a moment in time to which they cannot return. But saving Archer will restore a timeline where Mongers have complete control, mixed bloods are hunted prey, and the Descendant world is spiraling into chaos.

As Saira uses her Clocking skills to prevent her worst nightmares from coming true, she travels from the dirty streets of Victorian London to the secret archives of the Vatican. She seeks a purpose that is greater than smashed hope, greater than lost love, greater than the prophecy that has shaped her very existence. She must use the lessons of history to free the present and shape the future, and in the end, Saira and her friends will face War and Death in the most important battle of all - the one for Peace.