Brand new crime thriller kicks off tonight from the makers of hit shows The Missing and Liar, starring Game of Thrones' Richard Dormer (Beric Dondarrion). He takes the lead as DCI Gabriel Markham who, along with his team, are trying to track down a serial killer. A break in the case leads them to a potential suspect, but Detective Gabriel is torn between his conviction that he already knows who the killer is and the seemingly irrefutable evidence found at the last murder scene. There's also a worry that Markham's intimate connection to the case may be skewing his professional ability to track down the perpetrator.