beautiful girl, good-looking guy, drove nice cars, beautiful children. >> until that summer day in 1997. when the unimaginable happened. >> male, kind of distraught. said that his wife fell overboard. >> it was a boating accident, said eric. and the coast guard agreed. something they see all too often. but soon, secrets emerged that would make some people wonder, what really happened to peggy beckler? coming up -- >> i absolutely had to find her. >> may be alive? >> mm-hmm, i did. >> she's a fabulous swimmer. >> where was peggy and what had gone wrong on that boat? >> you know, i'd been crying and face is red, and he looked upset. >> there would be a sea of questions to come. >> you thought what? peggy faked her death? >> when dateline extra continues. you know, in any job,