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.