Forty-six years later, and we still don't have an answer to that question. In this final installment of the Mainline Murders, we walk through the trials of both Bill Bradfield and Dr. Jay Smith — the theft conviction that cracked the case open, the jailhouse confessions that made stomachs drop, the physical evidence that pointed directly to Karen and Michael, and the appeal that let a convicted triple murderer walk free. All of it builds to the two loose threads that refuse to tie: where are those children, and who is truly responsible?

This one stings. Because the justice system got close — twice — and still, Susan Reinert's kids remain missing. Bill Bradfield died in prison in 1998, maintaining his innocence to the end. Jay Smith walked out of a Pennsylvania courtroom a free man in 1992, his murder convictions overturned on appeal. And Ka ...