Two years after Flight KA29's hijacking, Sam Nelson is thrust into another life-threatening ordeal—but this time it's personal.

Sam urges Otto to keep his cool as passengers begin to suspect something is wrong. Police Chief Winter races to mount a response.

Berlin police scramble to contain the situation. Sam pressures Winter to meet his demands. Marsha discovers she's being watched.

A shocking turn of events forces Sam to make a gesture of good faith. In London, Daniel calls on a friend to help look into what's happening in Berlin.

Anger and frustration among the passengers begin to boil over—just as Sam comes to a frightening realization.

To avoid further disaster, Sam must work with an unlikely ally. The enemy closes in on Marsha as Zahra and Daniel fear they’ve reached a dead end.