when detective ron elgas got the call. do you remember getting that call? >> yeah, because i was sleeping. >> reporter: he woke up fast to a very big problem. a killing. just didn't make sense. >> appearing like a ghost has done this. no evidence, no weapon. everybody in the house says i don't know. >> a ghost? >> yeah. that's what it feels like because you have no idea. >> reporter: how was it possible melissa hadn't seen the person who'd shot ben? she'd been lying right next to him. why was she unharmed? >> that's kind of a testy little red flag started popping up. okay, this doesn't seem right. >> reporter: and had craig, melissa's teenage brother truly slept through the whole thing as he claimed? >> i opened my eyes and right in my face was a bunch of barrels from a machine gun. >> reporter: it was police guns he was looking at, police who had already discovered shotgun shells on craig's bedroom dresser. >> here comes another red flag. is this a possibility? he is faking? >> reporter: melissa, craig, and little alyssa were taken to the sheriff's departm