When struggling journalist Cecily Wong is invited to join an expedition to climb one of the world's tallest mountains it seems like the chance of a lifetime. But she doesn't realise how deadly the climb will be. As their small team starts to climb things start to go wrong. There's a theft. Then an accident. Then a mysterious note pinned to her tent: there's a murderer on the mountain. The higher they get the more dangerous the climb becomes and the more they need to trust one another. And that's when Cecily finds the first body . . .