Outside the island there is nothing: the world destroyed by a fog that swept the planet, killing anyone it touched. On the island: it is idyllic. 122 villagers and 3 scientists, living in peaceful harmony. The villagers are content to fish, farm and feast, to obey their nightly curfew, to do what they`re told by the scientists. Until, to the horror of the islanders, one of their beloved scientists is found brutally stabbed to death. And they learn the murder has triggered a lowering of the security system around the island, the only thing that was keeping the fog at bay. If the murder isn`t solved within 107 hours, the fog will smother the island - and everyone on it. But the security system has also wiped everyone`s memories of exactly what happened the night before, which means that someone on the island is a murderer - and they don`t even know it. The outstanding new high-concept murder mystery from the Sunday Times bestselling and Costa Book Award winning author of The Seven Deaths of Evelyn Hardcastle. An ingenious puzzle, an extraordinary backdrop, an audacious solution.