In July 1966, a Park Ranger for the Indiana Dunes State Park came across a blanket of sandy belongings that had been left behind on the beach by three young women.

And so began one of the greatest mysteries the American Midwest would ever know.

Go to twitter @unexplainedpod, facebook.com/unexplainedpodcast or unexplainedpodcast.com for more info. Thank you for listening.

See omnystudio.com/listener for privacy information.

See omnystudio.com/listener for privacy information.