Deep Cover By Russell, Leigh

When a sex worker dies in suspicious circumstances in York, Detective Inspector Geraldine Steel struggles to remain focused on the murder investigation. She is distracted by her worries about her colleague and life partner, Ian Peterson, who has disappeared. Geraldine becomes close to her colleague, Matthew. She is unaware that Ian is working undercover in London, helping to identify a criminal gang who have been targeting Geraldine. As a second victim is discovered in York, Ian's life is threatened by a psychopath. If he fails in his mission, both he and Geraldine may die...