Two detectives are dispatched to investigate the murder of a young girl on the outskirts of Dublin, but as the case of the missing children intensifies, both are forced to confront the darkness that lies in their past.

Sarah Greeneas Detective Cassandra 'Cassie' Maddox
Killian Scottas Detective Sgt. Robert 'Rob' Reilly
Peter McDonaldas Jonathan Devlin
Leah McNamaraas Rosalind Devlin
Conleth Hillas Superintendent O'Kelly
Tom Vaughan-Lawloras Detective Frank Mackey
Kathy Monahanas Margaret Devlin
Amy Mackenas Katharine 'Katy' Devlin / Jessica Devlin
Eugene O'Hareas Detective Quigley
Moe Dunfordas Detective Sam O'Neill
Sarah Phelps
Chandni Lakhani