HE USED A HAND SAW . . . On Valentine's Day 2007, in a suburb of Detroit, stay-at-home dad Stephen Grant filed a missing person's report with the local sheriff. Grant's wife Tara had disappeared five days earlier. He'd been searching for her ever since - or so he claimed. HE STARTED WITH HER HANDS . . . Over the next two weeks, police questioned Grant. He lashed out, accusing them of harassment, pleading his innocence in television interviews. He...