The episode ended with the discovery that DCI Joanne Davidson (Kelly Macdonald) is related to a character known to fans.
Elsewhere in the episode, the show’s viewers think that a possible off-screen moment hinted at a future Steve Arnott revelation.
Line of Duty continues on BBC One on Sunday (18 April) at 9pm with an episode that sees the surprise return of a former character.
While the relative doesn’t necessarily have to be Scottish to be related to Joanne, Hunter being Scottish certainly works in this theory’s favour.
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