Throughout all of history people have randomly disappeared from the face of the Earth. It turns out they were being displaced into other realities. A secretive, government funded group in the US has big plans to bring them all back home.
A national park has caused over a hundred people to disappear in only three months. There's no proof they ever died, so naturally plenty of people decided they wanted to hike there for a plethora of reasons. I wonder where they ended up?