terry elvis: i was scared to death to open that trunk. andrea canning: a mysterious caller captured on camera. why would this person call from a payphone in the middle of the night? andrea canning: then, came the secret. he was married. rumors about her being pregnant. she truly did believe that he was going to leave his wife. andrea canning: anger, betrayal, revenge. a bomb exploded. it was world war iii. andrea canning: this crazy love triangle, kidnapping, potential murder? yeah. this is heather's life we're talking about. terrifying. when you see your parents hurting, you wish that you could take all their pain away. and something like this, it's impossible. hello, and welcome to "dateline." heather elvis was charging headlong into her future. an independent, young woman eager to make her mark on the world. then, one night she disappeared. investigators would quickly discover a love triangle and thought they had their motive. but there was a big question the elvis family still needed answered, where was heather? here's "the landing."