The story springs from the real-world headlines of religious cults and mass suicides. With Veil, it begins 30 years ago, when members of a religious cult known as Heaven's Veil take their own lives. The truth behind what really happened remains buried deep in the memory of the sole survivor, a five-year-old girl, who returns to the compound with a documentary crew as an adult. They soon discover something that is far more terrifying than anything they could have imagined.