Brighton based Detective Superintendent Roy Grace is a hard-working police officer who has given his life to the job, but his career is currently at rock bottom. He’s fixated by the disappearance of his beloved wife, Sandy, and running enquiries into long forgotten cold cases with little prospect of success. Following another reprimand for his unorthodox police methods, Grace is walking a career tightrope and risks being moved from the job he loves most.

The story of three generations told against the backdrop of the 20th century. The drama focuses on the life of Mary Corrigan, from her days as a rebellious mill worker in 1915 and her doomed love affair for a man who must fight for his country, through to her final days in the run up to the British General Election of 1997.

After a car accident, Lizzie lies dead on the roadside - slowly she is taken into the light - but is pulled back to earth when she is revived by the doctors. Lizzie feels sure that during the 184 seconds that she lay dead, something latched on to her and came back into her world. The nightmares and visions that follow only crystallize her belief that she should have died in the crash... Then the disturbances start, at first merely tappings and bad smells - but soon the activity escalates. Lizzie seems to be the focus, but according to others, she's just playing games for attention. Only when Kate, her mother, is confronted with inexplicable events does she face the possibility that they may be the victims of a poltergeist infestation