October 1962.
For thirteen days the world stands on the edge of nuclear war.
Doc has watched it end more times than he can count.
Each loop begins the same way. Thirteen days before catastrophe. Thirteen days to find the mistake. Thirteen days to persuade the right people, change the right decision, save the right life.
And every time, humanity burns.
From the corridors of the White House to the streets of Havana and the ministries of Moscow, Doc searches for the single variable that separates survival from extinction.
What begins as a race to stop a war becomes something far stranger: a mystery hidden within history itself, where courage matters more than power and a single act of human decency may outweigh the calculations of nations.
The Variable is a science-fiction thriller of time loops, impossible choices, and the thirteen days that decided the fate of the world.