the intrusion of an odd idea in one of the sermons of pastor james flanders. >> what do you think we'd experience? >> reporter: when he mentioned a couple of verses in the old testament that seemed to approve, somehow, of polygamy. >> he wanted to justify his relationship to everybody else through a biblical sense. >> reporter: so he went to the old testament and -- and pulled up those few lines that suggest polygamy. >> that's correct. >> reporter: a trial balloon? if it was, it quickly imploded. and the very practical polygamy in the home of the pastor stayed carefully under wraps. >> so if the news got out of the to the rest of the church, did tanya worry about what might happen there? >> that's what she was covering up. she had to protect james and protect their -- that was their world. >> reporter: did she do something to marie, to protect james? two months after marie disappeared the detectives got permission to look at the cell phone records of all three of them. would they prove tanya was with marie when she vanished and thus maybe did something to her?