Nine people survive a plane crash into the Mexican jungle, but they don't know that a murderer lurks in their midst; nine days later, their bodies are recovered by the Mexican army; one of the passengers is missing - but who?

Alliances form, enemies are made and lines are drawn as the passengers search for food and water; but when another passenger dies, they realize they may all be targets.

The survivors work out how to call for help - but are faced with a treacherous climb; as some of the group begin to crack under the pressure, a third death - the most violent so far - warns that they are running out of time.

The deadly secret hidden in Flight CBZ517 is discovered, but it still doesn't explain the murders or help the survivors escape; the passengers believe they have found the traitor in the group - but are they right?

Air authorities search desperately for the plane and federal agencies spring into action; as the group becomes smaller and smaller, the last survivors know they are going to have to fight to stay alive.

A high-octane showdown between the killer and one of their supposed victims reveals the secrets of flight CBZ51.