When a prominent French politician is found dead on the border between the UK and France, detectives Karl Roebuck and Elise Wassermann are sent to investigate on behalf of their respective countries. However, the case takes a surreal turn when a shocking discovery is made at the crime scene, forcing the French and British police into an uneasy partnership. As the serial killer uses ever more elaborate and ingenious methods to highlight the moral bankruptcy of modern society, Karl and Elise are drawn deeper into his increasingly personal agenda. Stephen Dillane, star of Game Of Thrones, plays the British detective, Karl Roebuck. Clémence Poésy (Birdsong) is his French counterpart, Elise Wassermann.