Martial artists Ashton Chen and Iko Uwais (The Raid) collide in this high-altitude thriller. When air cop Gu Chaoyang (Chen) boards his flight home, he becomes the final line of defense against a hijacking led by a ruthless adversary (Uwais). Trapped in the clouds, Yungang must use his elite combat skills and unwavering ethics to protect the passengers. What follows is a brutal, life-and-death struggle where there is no room for error and nowhere to run.