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In England, a group of space scientists led by Bernard Quatermass, who have developed plans for the first Moon colony, learn that a secret, ostensibly government-run, complex of identical design has been built in a remote part of England and is the focus of periodic falls of small, hollow "meteorites" originating in outer space. Quatermass determines to investigate and uncovers a terrifying extraterrestrial life form which has already begun action to take over the Earth.

A group of friends set out to investigate local legends surrounding the Slender Man, documenting their search with handheld cameras as curiosity slowly gives way to paranoia and fear. As strange occurrences escalate and the line between myth and reality begins to blur, the footage captures their unraveling descent into obsession. Presented in found-footage style, the film leans on minimal exposition and escalating dread to suggest an unseen presence stalking the group.