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Oh, the tension is almost unbearable as the action creeps towards the finale, when the intricate cat-and-mouse interplay between Spector and Stella reaches its shocking conclusion.

As Healy tries to see whether flaws in Stella’s investigation could prevent Spector from facing court, Anderson and Ferrington’s discoveries in London throw a spanner in the works and shed new light on proceedings.

Meanwhile, as Spector chats to another patient (there are other people as sick as him!), he undergoes an evaluation with Dr Larson, and Katie (TV’s most aggravating teen) has her own moment in court.

Don’t miss the final episode tomorrow  (times vary, BBC2).