driver's door unlocked and inside sherri's keys and a gift she'd bought for her mom, karlyne guess, karlyne, who at this point, still had no idea sherri was missing. around 8:30 pm when sherri's parents got home, her mom listened to a voicemail that mike had left on their landline. karlyne guess: he said, this is mike. give me a call. something's happened to sherri. josh mankiewicz: all kinds of terrible things entered karlyne's mind. i thought, was she in an accident? did she have appendix attack? josh mankiewicz: karlyne called mike back. and in an instant, her fears were replaced by one even worse. karlyne guess: he said, she's gone. josh mankiewicz: coming up, sherri dally captured on camera. detectives uncovered security video from inside the store. was she being followed? i was concerned that sherri was maybe abducted or something worse. josh mankiewicz: when "dateline" continues. [music playing] with dupixent, stay ahead of moderate-to-severe eczema. as you welcome the feeling of touch with clearer skin and less itch. the #1 prescribed biologic by dermatologists and allergists, helps