In the early 1970s, amidst the Cold War, the United States Department of Defense runs a covert mission to the Moon under the guise of the last officially cancelled NASA's Apollo missions. The mission's primary objective is to place anti-missile detectors to monitor the USSR. Two astronauts are deployed on the lunar surface, while a third remains in orbit. The team is tasked with setting up the equipment and gathering samples before returning to Earth. However, the mission takes an unexpected turn when the astronauts begin to detect strange phenomena.

Isolated and facing the inherent dangers of their lunar environment, the astronauts start to experience equipment failures and encounter inexplicable interference in their communication systems. As they explore further, they come across a derelict Soviet lunar lander and the dead cosmonaut inside, raising questions about previous unreported missions to the Moon. Tension escalates when one of the astronauts begins to act increasingly erratic, and the team discovers disturbing footage amidst their data collection. Unraveling the truth behind these mysteries becomes a race against time as their situation grows more dire, and they realize they may not be alone on the desolate lunar surface.