DCI Charlie Hicks, a malcontent police detective, grows suspicious of new partner DI Elaine Renko.
Renko persuades a journalist to publish the Hard Sun dossier, instantly rendering her a target for Secret Services.
Renko investigates evidence that suggests Hicks and Butler were corrupt; Grace makes Hicks an offer.
London is under siege as the scale and bloodiness of Blackwood's killing escalates.
The murder of a night jogger has dire personal implications for Renko and Daniel.
Tired of operating defensively, Hicks and Renko take the fight to Grace's door; Bell arrests Grace.