they just shook their heads. >> it was heartbreaking. nobody could talk >> just a lot of tears. >> that's when he knew. that's when i knew something. and i still didn't want to accept it. >> she was truly missing. and then a few hours later, 20 miles up the road, a police detective got up from his desk. >> i went out to my car and i got my lunch. and i was walking through the lobby, and spa isabelle ponce. isabelle is somebody that we knew. she was a police officer recruit, and resident. >> she seemed to be waiting for something. curious. he walked on, back to his office. set down. no idea what was about to warm its ugly way, into his world. >> coming up.