Samuel Blake ups his game, forcing Harry to make a near-impossible choice. The bracelet's power starts to wane.
Harry returns to London and sets out to prove his innocence, but on the run from the police he is faced with the stark choice of heading into the criminal underworld and joining those he once hunted. Once forced underground, whilst trying to prove his innocence, Blake finds a way to make him look more guilty than ever.
Following the explosion at MIS, DI Harry Clayton and the team are just getting back on track when his 'informer' Eve is accused of murder.