Forty days after the disappearance of Nancy Guthrie, investigators still have no arrest and no conclusive evidence in one of Arizona’s most troubling kidnapping cases. Sheriff Chris Nanos has now issued a chilling warning — the offender responsible could strike again while investigators and the FBI continue pursuing leads, surveillance evidence, and public tips. Tonight, retired NYPD detectives break down what investigators know, what evidence has failed to produce answers, and what could finally break this case open.