In 1966, the bodies of two men were discovered on a remote hill outside Rio de Janeiro, Brazil. They were lying side by side, dressed in matching suits and waterproof coats. What made the scene truly eerie were the lead masks covering their eyes, like homemade radiation goggles and the cryptic handwritten note found nearby:

"Be at the agreed place at 16:30. Take capsules after the effect, protect metals, await signal, mask..."

The victims, Manoel Pereira da Cruz and Miguel José Viana, were local electronics technicians with an interest in spiritualism and scientific experimentation. But there were no signs of violence, no clear cause of death, and no trace of drugs in their system.

To this day, the Lead Masks Case remains one of Brazil’s most baffling unsolved mysteries a story that has inspired decades of speculation involving UFOs, occult practices, government experiments, and everything in between.

In this episode of Mysteries at Bedtime, we follow the trail of clues from the bodies on the hill to the theories that have tried and failed to explain this chilling enigma.

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