no secret what the biggest obstacle was for lead investigators captain dan hally and detective jackienichols. >> it's an axiom in law enforcement -- no body, no crime. >> it's a challenge. >> at this point, we don't even know for sure that we have a death. we believe that in our gut. >> reporter: as the cops dug deeper into the background of the husband's friend, david stone, the case suddenly became way more complex -- a mind-blowing theory. maybe this wasn't just about one wife, rachael. maybe it was about two. the investigation had led them to the city maintenance yard where stone worked. a fellow employee there had related a conversation he'd had with david stone a while back. >> it surfaces that there had been some conversations between david stone and this individual about a plan to kill stone's wife for $10,000. >> reporter: then stone, the story went, came back sometime later and told the maintenance yard guy to forget they'd talked. he'd arranged a plan "b" for murder. >> and later, that deal was canceled because stone had reached an agreement with charles capone that they wo