>> reporter: through it all cari remained invisible, even after she texted dave she was moving into an apartment building nearby. i'm moving a couple buildings away. >> dave told police, of course. >> the building existed but the apartment number did not exist. >> near the complex, dave did find something that belonged to cari. coming up, a crucial discovery almost buried in the snow and the danger escalates. >> it was like, what in the hell? >> sometimes you'll be on range