all the hoynes. perhaps mr. hoynes most of all. >> our dad felt like he had not done what he was supposed to do. as a father, because he did not protect her. he did not keep her safe. >> our dad would sit at the edge of his bed and just think about robin. and wait for her to walk down the hall. every day. >> of course, they did not know -- none of them did, that the solution was sitting right there in plain sight. until somebody closed the lid and filed it all away. >> coming up, nearly 20 years would go by without a break, until a fresh pair of eyes focused on one particular photograph and saw something new. >> i thought, it couldn't, be it couldn't be. >> when dateline continues. you want to be able to provide your child with the tools or resources they need. with reliable internet at home, through the internet essentials program, the world opened up. fellas, fellas. that's how my son was able to find the hidden genius project. we wanted to give y'all the necessary skills to compete with the future. kevin's no