If your father was one of the most prolific serial killers in America, would you see the signs? It never occurred to Shirley Gaskins that the father she adored could be one, but the more people vanished without explanation, the harder it was to deny.

When Jack "Roy" Spillman started collecting wolf memorabilia, his sisters thought it was just an odd hobby. But when they learned of horrific things he had done, they realized people may have been right when they called him "more animal than human".