DI Elaine Renko ( Agyness Deyn ) is victim of a brutally violent attack. Six months later, she is assigned to work with DCI Charlie Hicks (Jim Sturgess - Upside Down ). He is suspected of corruption, because he is having an affair with his dead partner's wife ( Aisling Bea ).
The two detectives investigate the death of a computer hacker who downloaded a government folder entitled Hard Sun. This folder is a McGuffin that everyone is after. MI-5 has sent a hit-team the size of an infantry platoon, with the job of killing off any witnesses.
The climax sees the villains pit the protagonists against each other. Renko is a tall, skinny woman who is played by an ex-model, while Hicks is a dodgy policeman with a history of violence. Assuming that they both have the same level of training, how could the woman possibly win? Well, she uses a police-issue baton ... and a pair of brass knuckles!
This is set a month after the events of the previous episode. The government has written off the Hard Sun expose as being a baseless conspiracy theory. In reality, it would be considered unbelievable because nobody in the British Government is capable of planning anything. In the year 2020, the lack of planning for Brexit or Covid-19 is painfully obvious.
Unfortunately, Renko's actions have backfired because the really dangerous people seem to believe in Hard Sun. It justifies their desire to believe that there is no reason to hold back, so they can indulge whatever brutal pleasures they desire. For example, this week the cops investigate a spree killer who is killing everyone his ex-wife knows.
A religious fanatic (Richard Coyle - Prince of Persia ) starts on a murder spree. His targets are good samaritans - anyone who selflessly helps other people. His modus operandi is reminiscent of a villain in Luthor, a mainstream UK police procedural that has Idris Elba as the modern-day (Afro-Carribean) version of Gene Hunt, the anachronistically thuggis white cop in Life on Mars .
The religious fanatic (Richard Coyle - Prince of Persia ) is still on the loose. With the help of MI-5, the cops set a trap for him.
DI Elaine Renko ( Agyness Deyn ) discovers that the killer her team is hunting is her own son, Daniel Renko (Jojo Macari - ), who escaped from the mental hospital. Worse, he now has the flash drive with the Hard Sun data.
DCI Charlie Hicks (Jim Sturgess - Upside Down ) tries to get the flash drive back. The MI-5 woman sends her own team in. Not the full platoon, just a female Asian pistolero and a couple of men for muscle. All Renko has against the gun is her brass knuckles.
The MI-5 woman is targeted by her own team. Not the full platoon, just a female Asian pistolero and a couple of men for muscle.
The show was originally planned to run for five years. Because it was cut short, the makers had to tie up the plot in the final episode.