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DCI Ross Tanner of the Special Murder Unit is working on a case with the ambitious DI Catherine Tully when he makes the frightening discovery that he is slowly losing his sight. Tully discovers his secret and agrees to cover for him, on certain conditions.

DCI Tanner and company try to work through an ever-growing list of suspects for the murder. Tanner suspects that Matthew's stepfather, Adam, is hiding something, but does that make him the killer?

Detective Chief Inspector Tanner's elite new Special Murder Unit begins investigating their first case. The team must gather evidence against their prime suspect in difficult circumstances – but as Tanner struggles to conceal his failing eyesight, Detective Inspector Tully oversteps her authority, leaving him professionally exposed.

DCI Ross Tanner decides to recreate the scene of the vicious murder of Vicky Ingham, but his plan to use her young son creates conflicts within the Special Murder Unit. Tanner's moves come under close scrutiny from DI Boyd.

A man is found bludgeoned to death after his stag night. The following morning his fiancée, the daughter of a Labour peer, wakes to find herself covered in blood, but is adamant that she is innocent of murder.

Tanner continues to struggle with hallucinations as well as a terrifying recurring dream. All the evidence points to the victim's fiancée, but what was her motive for the murder?

Investigating orchestrated race violence, Tanner comes up against the malevolent and manipulative Harold King, a retired gangster, who is also blind. Just as Tanner has harnessed his blindness to uncover the truth, King uses his to realise his bitterness and hate.