Cambridge student and math prodigy Nick Hayes faces the ultimate puzzle when the flow of time begins to fray. Amidst the quiet of 1986, he grapples with the repercussions of his own history of time travel, only to encounter a girl who bears an uncanny resemblance to someone he thought he knew. As time's fabric tears, unleashing potential catastrophe, Nick stands as the linchpin to mend it. With his ex-girlfriend Mia and fellow student Helen by his side, he must make critical decisions with far-reaching consequences. Will Nick navigate the complexities of timelines to secure a stable future, or will his choices only propel him deeper into chaos? With the clock ticking ominously, he realizes that at stake is not just his own destiny but the continuity of the entire world.