Season 4
12 episodes
59 min. per episode
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Haunted by past cases, a relentless detective confronts buried secrets as they unravel chilling truths hidden within cold cases.
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Episodes
1948: Post-war Britain and an ex-soldier has been found dead with his skull nailed to the floor. Now this case has been re-opened due to media attention and pressure created by his grandson. The killer strikes again and the team discover another linked murder from the 1960s. A further victim is found nailed to the floor - this time in a nursing home for the elderly. Is the Second World War the linking factor? The team must find the next possible victim but no-one knows where he is.
Having established that the killer's victims are the surviving members of the same WWII regiment, Boyd and his team must find the next possible target, but no one knows where he is. The motive for the murders becomes clear when they uncover the story of a brutal gang rape that led to a pregnancy and suicide.
After a garage is demolished, the mummified body of a long vanished young man with IRA sympathies is found along with a car bomb.
Boyd and the team find that the murdered young man presumed to be Irish was really working for the English under a "false flag."
Five-year-old twins Cindy and Jason were abducted in 1988. Sixteen years later, Jason is struck by a car and identified by his DNA after he is admitted to hospital. The hunt now begins to locate Cindy, but Jason cannot recall anything about his life. DS Boyd does not think it is a coincidence when he discovers the driver that struck Jason had crossed paths with the boy shortly before the abduction. Meanwhile, Jason disappears and a police raid in a search for Cindy has tragic results.
Drama series following a team of detectives who investigate unsolved murders using modern technology.