adding up. he checked to see if bo and cher might have left the country. >> i knew that bo cher, both of them, their passports had not gone through the airport. and if you look at immigration movements, both of them you can check if they come in, when they come in. >> they're still in panama. >> they came in, they never left. so they're still in panama somewhere. >> but where? there was one more piece of the puzzle falling into place. and that would point a finger of suspicion at someone living right among them. >> coming up -- >> bill was the loudest voice in the room. he text everybody and said, your lord commence you to come to the party. >> a pirate out to make a killing in real estate. >> she wasn't selling that property. she loved it. >> bill showed up and said yeah, i bought everything. >> when "dateline" continues. [tires squealing]