Alyssa Nasca

After receiving a chilling call about a classmate's unexpected death, a social-media-obsessed teen is followed by a mysterious account. Worried that it's all connected, she begins to fear that the account's reach extends far beyond the limits of her phone screen.

In the criminal justice system, sexually-based offenses are considered especially heinous. In New York City, the dedicated detectives who investigate these vicious felonies are members of an elite squad known as the Special Victims Unit. These are their stories.