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invites a friend to sleep over. the next morning, she's dead. >> oh, my god! i don't feel a pulse. >> what in the world happened? how could this be? >> turned out this was no ordinary slumber party. >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> stories surfacing of a dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in your family. >> you have a lot of ...

>> a bright and beautiful teen invites a friend to sleep over. the next morning, she's dead. >> oh, my god! i don't feel a pulse. >> what in the world happened? how could this be? >> turned out this was no ordinary slumber party. >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> stories surfacing of a dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in you...

dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in your family. >> you have a lot of people watching "dateline" that need to talk to their kids. >> welcome to dateline. parents always worry there are so many dangers out in the world a teenager can face. but at a slumber party in your own basement? how could something deadly have found its way there? taken a bright, talented girl. and could it happen in your to...

Friend on stand-by to call in case something went wrong. and as teenagers do, they had their phones out taking photos and videos. this is some of the video taken that night. >> [laughs] >> reporter: the video showed investigators how the night went from a fun, giggly high -- >> how do you feel, tara? >> i don't know. pretty weird. >> reporter: to this. tara lying unresponsive on the basement floor. she was in serious trouble, but her friend never woke tara's parents who were right upstairs, and she never called 911. but she did call the friend who had agreed to help in an emergency, and she sp...