Impostors, scams, the mystery of the "crack master" -- this week, stories about mystery and investigations. Featuring 1) The Dropout: Convinced of her own destiny even as a young child, Elizabeth Holmes would drop out of Stanford in her late teens, intending to model herself after the great tech icons of our time. Her obsession with Steve Jobs - down to his signature black turtlenecks - would become particularly pronounced as she launched her company Theranos. 2) The Dream: Multi-level marketing companies often promise you part time work and high salaries. But according to The Dream, it seems very few participants successfully make a living. Katie worried her work as a daily news reporter would be challenging once she had a family. She thought that being a Mary Kay consultant would offer the flexibility she wanted. She shares her story. 3) Believed: How did Larry Nassar, a respected gymnastics doctor, get away with abusing hundreds of women and girls for two decades? Believed is an inside look at how a team of women won a conviction in one of the largest serial sexual abuse cases in U.S. history. 4) Studio 360: In the mid-1970s, Jon Armond was traumatized by something he saw on "Sesame Street." It was a cartoon about a little girl who encounters creatures formed by the cracks on her bedroom wall - including a horrifying, screaming face who called himself "The Crack Master." Decades later, Armond wasn't sure if the cartoon actually existed... until he discovered a subculture of obsessives who remembered the exact same thing. 5) Uncover: The Village:  Host Justin Ling investigates Bruce McArthur and whether he's connected to nearly two dozen murders from Toronto's Gay Village. 6) Over My Dead Body: Dan and Wendi are two good-looking attorneys whose wedding was featured in the New York Times. But when this "perfect" couple falls apart, it leads to a bad breakup and a terrible divorce. Then, a murder case involving a menagerie of high-priced lawyers and unexpected co-conspirators.