When the Police Service of Northern Ireland are unable to close a case after 28 days, Detective Superintendent Stella Gibson of the Metropolitan Police Service is called in to review the case. Under her new leadership, the local detectives must track down and stop a serial killer who is terrorising the city of Belfast.
 | Season 1 Episode 1 Dark Descent Air Date: 2013-05-13 Duration: 60 min |
 | Season 1 Episode 2 Darkness Visible Air Date: 2013-05-20 Duration: 60 min |
 | Season 1 Episode 3 Insolence & Wine Air Date: 2013-05-27 Duration: 60 min |
 | Season 1 Episode 4 My Adventurous Song Air Date: 2013-06-03 Duration: 60 min |
 | Season 1 Episode 5 The Vast Abyss Air Date: 2013-06-10 Duration: 60 min |
 | Season 2 Episode 1 These Troublesome Disguises Air Date: 2014-11-13 Duration: 60 min |
 | Season 2 Episode 2 Night Darkens the Streets Air Date: 2014-11-20 Duration: 60 min |
 | Season 2 Episode 3 Beauty Hath Strange Power Air Date: 2014-11-27 Duration: 60 min |
 | Season 2 Episode 4 The Mind Is Its Own Place Air Date: 2014-12-04 Duration: 60 min |
 | Season 2 Episode 5 The Perilous Edge of Battle Air Date: 2014-12-11 Duration: 60 min |
 | Season 2 Episode 6 What Is in Me Dark Illumine Air Date: 2014-12-18 Duration: 90 min |
 | Season 3 Episode 1 Silence and Suffering Air Date: 2016-09-29 Duration: 60 min |
 | Season 3 Episode 2 His Troubled Thoughts Air Date: 2016-10-06 Duration: 60 min |
 | Season 3 Episode 3 The Gates of Light Air Date: 2016-10-13 Duration: 60 min |
 | Season 3 Episode 4 The Hell Within Him Air Date: 2016-10-20 Duration: 60 min |
 | Season 3 Episode 5 Wounds of Deadly Hate Air Date: 2016-10-27 Duration: 60 min |
 | Season 3 Episode 6 Their Solitary Way Air Date: 2016-10-28 Duration: 60 min |
| Art | Sara-Jo Baugh | Art Direction |
| Art | Gillian Devenney | Production Design |
| Production | Eoin Holohan | Location Manager |
| Costume & Make-Up | Sharon Watson | Hairstylist |
| Costume & Make-Up | Eimer Ní Mhaoldomhnaigh | Costume Design |
| Camera | David Grennan | Director of Photography |
| Production | Gub Neal | Producer |
| Costume & Make-Up | Pamela Smyth | Hair Designer |
| Costume & Make-Up | Pamela Smyth | Makeup Designer |
| Production | Patrick Irwin | Executive Producer |
| Production | Allan Cubitt | Executive Producer |
| Crew | Donal O'Farrell | Stunt Coordinator |
| Production | Justin Thomson | Executive Producer |
| Production | Carla Stronge | Casting |
| Editing | Wayne Brooks | Dialogue Editor |
