Physically and mentally scarred DCI Gabriel Markham confronts suspected serial killer Steven Mills, who is shot dead by marksmen whilst reaching for his phone. Gabriel's lover Elaine and other colleagues celebrate closure of the case but Gabriel begins to doubt Steven's guilt, citing his schizophrenia and attendance at psychiatrist Isaac Taylor's clinic. The day before sees Gabriel quizzing Steven's wife Beth after his DNA is found at the last murder scene but Gabriel also suspects Patrick Barker, boyfriend of one of the victims, Christine Levison, who left the country in a hurry. Gabriel returns to his wife Lisa, who is aware of his affair with Elaine, whilst Steven escapes from custody.
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