tammy cocard: underneath the bush. as if they had been hidden there or what? yes. on (voiceover): in their minds, only one person could have hidden them-- ken. later, as tiffany and tammy were about to drive away from the condo, having thrown in the backseat a sealed envelope ken had left out for them, suddenly, tiffany remembered something else her mother told her. she says, tiff, i have to tell you something. and it's important. and she said, if anything ever is to happen to me, i want you to ask ken for your baby pictures. remember that, ok? just remember that. keith morrison (voiceover): and sure enough, that appeared to be what ken had just given them. they tore open the envelope. and inside, most definitely not baby pictures. andrea canning (voiceover): coming up. keith morrison: there it was-- mm-hmm. --evidence she left for you to find. yes. andrea canning (voiceover): what could be a revealing clue from their mom, when "dateline" continues. with dupixent, stay ahead of moderate-to-severe eczema. as you welcome the feeling of touch with clearer skin and less