11) Line of Duty – Series four premiere (2018)
Line of Duty is one for shocking cliffhangers, and the series four premiere is no exception. The hour-long episode opens with the arrest of a suspect in the murder of a police officer. Still, things turn dark as investigating officer Ted Hastings sees allegations of corruption thrown his way. As the drama progressed, the question in everyone's mind was, "Who to believe?" Such a twist left fans glued to their screens and set up other explosive revelations that followed in subsequent episodes.
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Edited by Mudeet Arora