When a killer executes 19-year-old Abigail Gasca-Chavez in her own home, the only witnesses are her toddler and neighbourhood surveillance cameras; detectives close in on a suspect, but when he heads for the Mexican border, it's a race against time.

In Groton, Vermont, a young man with a developmental disability leaves work and is never seen again; with no leads in sight, investigators must rely on surveillance footage to piece together the truth behind Christopher Gray's disappearance.