Two teenagers, Hailey and Cameron, live through the same 2,500 years of history, but their experiences are diametrically opposed. Hailey's narrative unfolds backward in time, from the present day to the Big Bang, while Cameron's progresses forward, from the Big Bang to the present. Their lives, though separated by millennia and perspective, are destined to intersect.

The novel is recognized for its ambitious and complex narrative structure, presenting a unique challenge and reward for readers. Its experimental format, including the opposing timelines and unconventional typography, has been a significant point of discussion among critics and readers alike. The book is often lauded for its intellectual depth and its exploration of profound themes related to time, history, and the human condition. While its challenging nature may not appeal to all, those who engage with its intricate design often find it a deeply resonant and thought-provoking work.