Going Wrong (v5)
by Ruth Rendell
Once Guy and Leonora were lovers. Now it's over but Guy can't forget...or forgive. Every day he calls Leo with fantasies about their love and their future. All she wants is him out of her life. But Guy isn't about to oblige. Then Leo announces her engagement and finds out just how sick he is. When Guy tries to kill two members of her family, she gets in touch with her own peril. "Rendell is a master of depicting the long, slow ride into madness, making each tiny step toward the abyss resound with chilling logic." (Publishers Weekly)