In the dark river - 4

As Swallow and the detectives of G-division at Dublin Castle grapple with two challenging murder cases, the British officials who rule Ireland look on as CS Parnell, the man who might have secured political independence for Ireland, self-destructs.

Swallow and his boss, the legendary Chief Superintendent John Mallon, struggle to contain the extremists who believe that the only course now is renewed violence.

As the action takes us from the back streets of Dublin to atmospheric Victorian London, fans of the genre will enjoy the expanded horizons of the series.