From her hiding place in Downtime, Evelyn Marcin risks her fugitive anonymity for a curious glimpse of the next shift. What she witnesses sparks a chain of events and a journey that could decide humanity's fate. Helped by mysterious allies she unpicks her old reality, uncovering the self-interested manipulations of her superiors - and the real origin and purpose of the echo loop. Questioning their motives and beliefs though, she must also question her own. Her place in history is unwanted, inescapable and inevitable - like the choice that has fallen to her.