Orla and Conor Quinn are the perfect power couple: smart, successful and glamorous. But then the unthinkable happens. Their only son, Tom, is the victim of a deliberate hit-and-run. Detective Garda Cathy Connolly has just left Tom's parents when she is called to the discovery of another body, this time in Dillon's Park, not far from where Tom Quinn was found. What led shy student Lauren O'Reilly to apparently take her own life? She was a friend of Tom's and they both died on the same night - are their deaths connected and if so, how? As Cathy delves deeper, she uncovers links to the Dark Web and a catalogue of cold cases, realising that those involved each have their own reasons for hiding things from the police. But events are about to get a lot more frightening...