Bill Marks (Liam Neeson) is an air police officer who was ordered to perform security duties on a plane flying to London. During the flight, he received a text message from an unknown number. The sender of the text message knew everything about his actions and asked him to transfer $150 million to a secret account, otherwise he would kill a passenger on the flight every 20 minutes. Bill realized the seriousness of the situation and tried to find the person who sent the text message with the help of flight attendant Nancy (Michelle Dockery) and passenger Jen (Julianne Moore). But the development of the matter was far beyond his expectations. Bill, who wanted to save everyone, accidentally caused the death of several people, and he was also regarded as a hijacker by other passengers. Can Bill turn the tide, save the passengers on the plane, and wash away his guilt?