On one side: sunlight, warmth, breathable air. On the other: instant, absolute zero.

Entire oceans freeze mid-wave. Cities vanish beneath a crushing cold. Within hours, three-quarters of the Earth is gone.

NASA thermal engineer Graham Ellis is on a beach in the Dominican Republic when the Boundary arrives—watching helplessly as the ocean before him turns to solid ice. Racing home to Florida, he joins a desperate scientific effort to understand the impossible: the sun is shrinking, and a perfect circle of survivability has formed around the Americas.

As panic spreads and governments collapse, Graham’s nine-year-old daughter Maya begins whispering things she shouldn’t know—about a second sun, about the cold that’s “hungry,” and about the shrinking circle of light humanity is trapped inside.

What begins as a scientific mystery becomes something far more urgent: The sun is dying. The Boundary is closing. And no one knows why. Boundary is a gripping, atmospheric techno-thriller blending apocalyptic suspense with high-concept science fiction.

For fans of The Day After Tomorrow, The Three-Body Problem, and Interstellar, this is a chilling tale of survival, cosmic mystery, and the race to save a dying world from a force beyond imagination.