here's keith morrison with "someone was out there." >>> there are children born into this world for whom the dance never ends. for whom joy seems uncontained. for whom exuberance is uncontainable. >> what are we doing right now? >> we're riding on the roof of a car. >> there was this young woman, a sprite really in a young woman's body who loved adventure and people and who danced to music no one else could hear. which is why -- >> it haunted me. this case haunted me. >> haunted the police. haunted the whole town. >> is there a serial killer around? >> a serial killer with plans for two women in one particular church in one particular photograph. >> i was like this is insane and everybody needs to find this person. >> yes. but it began with that girl that sprite. >> just the freest spirit that you could think of. like literally not having a care in the world. >> kate cook is talking about her friend and fellow missionary amy jane brand brandhagen. kate and amy jane went to india and nepal together back in 2012. small town girls, kate from wisconsin, amy jane from oregon. >> she's always

here is keith morrison with "silent witness." >> i think i paused for a second and had to take a deep breath. and just the reality of what was going on would sink in. >> reporter: those who sought footprints will not forget them. they were tiny and they were bloody. >> i had to get my composure to finish searching this house to make sure there was nobody else in the house. >> reporter: it was november 3, 2006 early afternoon. deputy scott earp had been dispatched to a neighborhood enchanted oaks the outskirts of ralei raleigh, north carolina. here for the 911 call from this place, on birchfield drive. the caller was meredith fisher. she had just discovered on the floor of the master bedroom, the savagely beaten body of her elder sister 29-year-old michelle young, a woman who in death was about to be famous. >> reporter: as she spoke, meredith was cradling her niece, cassidy the who crawled out from under the bed clothes on her parents' bed, feet from where her mother lay. cassidy's voice chattering to her aunt. was caught on the phone call. had cassidy witnessed the murder awakened al

here's keith morrison with "bad blood." >> reporter: once in a while, in a complicated life, a womanan get lucky. which is why you're looking at a sweet little town called conyers, georgia. antique downtown ringed by gated communities, good schools, a sheen of new-ness. it was, really, pure luck that brought nikki whitehead to this house, in this quiet, safe neighborhood. just far enough away from atlanta that capital of overheated ambition down the highway. here in conyers she could give her beautiful twin daughters a better life than hers. but of course luck, fortune, fate, can go either way. sometimes in ways very hard to comprehend. >> everything about this goes against nature. >> how could somebody do that? >> it was definitely the bloodiest crime scene i've ever been to. >> reporter: in the next few minutes, you will know exactly when it happened, where it happened, how it happened. but of course the real question is why it happened. and the answer to that, as you will see, it's kind of complicated. but that's how nikki whitehead's life was. >> i loved everything about nikki. >

here is keith morrison with a perfect spot. >> a winter's night in a southern forest. the ink black darkness parted briefly by their headlights. and closed around them like a slud shroud as they made their way in separate cars through the foggy overcast. then here it was. the rugged clearing the muddy patch of sand and dirt away from the world, a place for their valentine any tryst. as if they could see without the artificial light so much as a hand in front of their faces or the fate lurking out there in the dark. waiting. but, what a way to begin a love story. better probably the hot air balloons the man so loved. and the motorcycles on which together in day light they discovered their own special place, the remote forest clearing in a place called belton bridge park. though park is much too grand a word for the little pull-out beside the chatahoochie river. they were richard and stacy sheck, it was their love of scouting that won the admiration of greg. >> how did you meet them? >> both of our sons were cub scouts. >> with kids. boys especially. they were naturals.

here's keith morrison with "the secret life of a soccer mom." >> reporter: the news spread like the morning sun across grand junction in the high desert on colorado's western fringe. as inexplicable and frightening as the burned car, the tossed wallet, the vanishing. it was june 28, 2007. over the mountains, in denver, four hours away, frank birgfeld was driving to his office. phone rang. >> voice on the phone says, this is somebody with the mesa county sheriff's office. and he said, are you paige's dad? and i said, yep. and he said, did you know she's missing? >> reporter: barbra campbell got the call from her husband, hans, who told her. >> paige is missing. what do you mean she's missing? >> reporter: andrea land got the news in an e-mail. >> it said paige is missing in the subject line. i knew something horrible had to have happened because it didn't make any sense that she would be missing. >> reporter: no way for even a best friend to prepare for such a thing. nor any way to understand just how much of it was going to be a mystery. how much they did not, could not know about the life

here's keith morrison with in the dead of night. ♪ >> reporter: some people blamed the booze.t is, when it was all over. in the hard light of a winter morning here in phoenix, arizona.. >> he was extremely intoxicated. when the body bag made its way to the morgue and the folks from csi craned their necks around fallen furniture and telltale pools of blood. and the survivors struggled to explain. >> i'm trying to remember it as best i can. >> reporter: that it must have been the booze or the gun. >> a pistol, a semi-automatic handgun. >> reporter: where did that come from? or that email the one that preceded so much vodka. >> and i was like, you know, "why are -- why are you trying to worry about this now? like, there's nothing you can do. >> reporter: something had to be going on that no one understood. >> it was weird and it didn't make sense -- >> he would never do that. >> when you start putting all the pieces together, you only get one explanation and that's murder. >> reporter: well, to understand any of it, this is as good a place as any to begin san clemente, california