A WORLD HALF IN DARKNESS. A SECRET SHE MUST BRING TO LIGHT.

2059. The world has stopped turning.

One half suffers an endless frozen night; the other, nothing but burning sun.

Only in a slim twilit region between them can life survive.

In an isolationist Britain clinging on in the twilight zone, scientist Ellen Hopper receives a letter from a dying man. It contains a powerful and dangerous secret.

One that those in power will kill to conceal...