The story of a young couple whose lives were shattered by a series of anonymous online attacks, which rapidly escalate into death threats. Rookie detective Emily Richardson is faced with the first big challenge of her policing career, trying to work out what's really going on after each of the couple separately report a series of harassing phone calls and death threats from an unknown third party.

A woman calls the police at 4am. She's in deep trouble and many miles from home. Soon she's in a coma. Can detectives solve the mystery of how she got this way?