Eleven light-years away, another Earth is living the life we left behind.
When the Far Meridian space telescope discovers an exact duplicate of Earth, scientists believe they are watching humanity eleven years in the past. The continents match. The cities are familiar. Even the people have counterparts.
Then the differences begin.
A plane that crashed here lands safely there. Wars never happen. People who died on our Earth are still alive on theirs.
For Dr. Katherine Calder, the discovery becomes devastatingly personal. Eleven years ago, her twelve-year-old daughter Sophie died in a plane crash—a loss that shattered Katherine’s marriage and changed the course of her life.
On Earth Minus One, Sophie survived.
Now twenty-three, she is alive, real, and somehow becoming aware that Katherine’s world is watching.
As governments race to exploit the other Earth’s history, memories begin crossing between realities and the connection between the two worlds grows dangerously unstable. What began as the greatest scientific discovery in human history may become a threat to both civilizations.
And Katherine is forced to confront an impossible question:
If saving another Earth meant risking your own, would you still warn them?