A silent killer stalked the Rhode Island countryside in the late 19th Century, decimating families one slow, lingering death at a time. But in a strange turn of fate one of those victims - 19-year-old Mercy Brown - would be turned into the villain. Join us as we look at how folklore and superstition still held fast during one of the most rapid periods of scientific advancement in American history, and what really was behind the deaths of the Brown Family as well as millions of others.