People begin slipping into a strange, frozen state… unable to move, unable to speak, yet somehow still aware.

In this episode of Clue Me In, Liv, Kay, and Grace dive into the eerie mystery of Encephalitis lethargica—a condition that left doctors searching for answers and patients trapped inside their own bodies.

What caused it? And why did it disappear just as suddenly as it appeared?

Follow the clues… this is one case you’ll want to be clued into.