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.

She doesn't realize 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.