Police hope a fitness tracker will solve the mystery behind a brutal death.

A detective enters the digital world to catch a vicious child killer.

Detectives follow a digital trail to uncover what happened to a young mom.

When two 13-year-old girls go missing, detectives immediately turn to their digital devices for clues to where they might be. Discovering the girls have been talking to strange men online, it's a race against time to find them before it's too late.

When 3-year-old Brendan Creato is found dead in a creek in Haddon Township, NJ, the whole community is rocked. With no physical evidence, investigators must turn to the digital evidence to uncover the horrifying truth about who killed Brendan.

When 21-year-old Julie Ann Gonzalez suddenly goes missing, her family instantly know that something is wrong. With no physical evidence, detectives from Austin PD turn to Julie's puzzling digital trail to uncover the horrifying truth behind her disappearance.