The story begins with a group of four close-knit friends Emma (played by Jessica Chastain), Ben (played by John Boyega), Sarah (played by Florence Pugh), and Kyle (played by Rami Malek) who decide to take a break from their busy lives and reconnect on a weekend hiking trip in the Colorado Rockies. The group is excited for a peaceful, adventure-filled weekend surrounded by nature’s beauty.

However, their idyllic escape quickly turns into a nightmare when, on the second day of their hike, an unexplainable phenomenon occurs—an earthquake followed by a series of strange atmospheric disturbances. The group experiences elevated altitudes where their sense of time and space becomes distorted. Disturbingly, their surroundings begin to look increasingly unfamiliar, as if they’ve crossed into an alternate reality or have been transported to a parallel world.

With communication devices malfunctioning, navigation tools failing, and no way to make contact with the outside world, the group’s unity starts to unravel. The wilderness, once their sanctuary, becomes a claustrophobic and increasingly dangerous environment. As they face cold weather, dwindling supplies, and growing psychological stress, tensions between the friends rise, and they begin to suspect that one among them may not be who they claim to be.

The film’s mystery intensifies as Emma starts having hallucinations of strange, shadowy figures in the distance and hearing eerie voices. Could the natural disturbance have altered their minds? Or is something far more sinister at play?

As the group’s desperation grows, they are faced with more than just survival they must confront their own personal demons. As secrets about each of them slowly come to light, they are forced to decide whether to trust one another or face an even more terrifying fate if they remain divided.