Teri Knight spent weeks driving cross-country, desperately searching for the secret her ex-husband, Manuel Gehring, took to his grave. It took years before a stranger finally solved the mystery that haunted her ever since learning he died in prison.

A more intimate interview with the Keller family surfaces new information. They never suspected the man terrorizing their city could be one of their own. As the Kellers realize their son hides a sinister secret, they must decide whether to turn him in.