In 2012, Brandy Rosine drives an hour into Pennsylvania, but as night falls, the college student stops answering her family's calls. It's up to her mom to follow a trail of digital breadcrumbs Brandy left behind to find her.

Shockwaves rip through a college campus in Missouri when 21-year-old Jesse Valencia is found, his throat slashed. With a litany of suspects – and a secret revealed by Jesse – investigators must untangle a web.

In the winter of 2013, 14-year-old Shaniesha Forbes never made it home after school. Her charred remains turn up on a Brooklyn beach days later, but this teen leaves behind a mountain of digital evidence for the NYPD to sift.