It has been twenty years since the group last met, and although at first it seems that little has changed between them, behind the laughter and stories, secrets emerge from their collective past that create rifts between the friends.

As time passes Sara, who has apparently organised the weekend, becomes increasingly agitated by the absence of the mysterious Ángel (whom the friends refer to as "The Prophet").

Finally she confesses that it was Ángel himself who had instructed her to invite everyone to Sergio's cabin for the reunion, a revelation that greatly disturbs the rest of the group.

Moments later the group is startled by an eerie flash that illuminates the entire night sky, accompanied by an ominous rumbling; when it ceases the friends hear the sound of animals and birds crying out in panic.

They soon discover that all power and communications are out, all electrical and electronic devices including their cars and phones are totally inoperable, and they have no contact with the outside world and no way to leave except on foot.

The next morning the group decides to walk to the next farm to get help, but they find it totally deserted, with two vultures scavenging food from the dining table, and everything appears as if the occupants have left very suddenly.

They gradually realise that the phenomena caused by the previous night's event seem to be in effect everywhere, and that all the people they might have expected to encounter have apparently vanished, as if into thin air.

Heading down the mountain, they traverse a narrow, precipitous path cut high into the face of a steep river gorge.

They find bicycles, collect some food, and decide to ride to the nearest town, but just as they are about leave they are suddenly surrounded by a pack of ravenous German Shepherd dogs, which begin to attack them.

Inside, Felix reveals to Maribel that the images in Ángel's sketchbook are indeed prophetic, depicting in sequence each of the bizarre incidents that have befallen them.

Felix reveals that, at the car crash site, he had also found the torn-out final page of Ángel's prophetic sketchbook, which seems to indicate that only Eva will survive.