A group of friends, who are amateur pilots, decides to go on a weekend trip aboard a small plane. The journey includes Sara, an inexperienced pilot who recently received her license, along with her boyfriend Bruce, and their friends Mel, Cory, and Sal. What starts as an adventurous getaway soon turns into a nightmare when the plane encounters sudden and turbulent weather conditions. As Sara tries to retain control of the aircraft, they inexplicably lose communication with air traffic control and become aware of a malfunctioning altimeter, which constantly fluctuates and shows them ascending uncontrollably.

Trapped in a dire situation with dwindling fuel and rising panic among the passengers, the group faces not only the perils of mechanical failure but also personal fears and deep-seated tensions that surface under duress. Haunted by a traumatic memory of her mother's death in a similar incident, Sara must confront her past to navigate through the increasingly hostile skies. As they drift farther into what seems like an endless and surreal sky, the friends grapple with the unfolding mystery and urgency of their plight, which carries with it an encroaching sense of supernatural elements, casting doubt on any chance of a straightforward resolution.