Forensic pathologists Professor Leo Dalton, Dr Harry Cunningham and Dr Nikki Alexander are back in one of the BBC's most successful and longest-running crime dramas. Series 11: Apocalypse an RAF helicopter crashes onto a detention centre for asylum seekers, Harry suspects the MOD may be covering up the true cause of the helicopter crash. Suffer The Children The discovery of a mutilated child’s body in a river raises the question of ritual killing Meanwhile, Nikki investigates the death of a priest from a local school. Hippocratic Oath A post mortem on a child who died during pioneering surgery prompts Nikki to investigate a leading paediatrician with an unusually high mortality rate. Double Dare Nikki is forced to revisit an emotive and controversial case from her past when a notorious female murderer is herself murdered. Meanwhile, Harry is investigating two unidentified bodies found in the garden of an empty house. Peripheral Vision Nikki clashes with DCI Mays over the guilt of a gypsy he suspects of a double murder, while Harry takes on an insurance company which is refusing to pay out life assurance over a case of CJD.