If you scrolled through the Instagram feed of 19-year-old Maddy Holleran, you would see a perfect life: a freshman at an Ivy League school, recruited for the track team, who was also beautiful, popular, and fiercely intelligent. This was a girl who succeeded at everything she tried, and who was only getting started. But when Maddy began her long-awaited college career, her parents noticed something was different. Previously indefatigable, Maddy became...