Inside kids' chilling Slenderman murder plot

On the morning of May 31, 2014, three 12-year-old girls awoke to a breakfast of strawberries and donuts. It was a Saturday in the sleepy town of Waukesha, Wis. The night before had been a slumber party at Morgan Geyser's house to celebrate her 12th birthday. Morgan didn't have a lot of friends, and the...