I watched this primarily because Nicola Walker is in it and she never disappoints. As much as I loved her in River and Unforgotten, it’s was refreshing to see her play a non-detective in a police show detective (she was brilliant as a perpetrator in another series).

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This show, like so many other British TV shows, uses a conspiracy involving members of some security forces in its principal plot. It’s an oft-repeated plot.

Secondly, the personal lives of several characters have no bearing on the plot, so their purpose seems to be ...