The Shadows in the Street by Susan Hill

Someone is murdering prostitutes around Lafferton, and the police, including DCS Simon Serrailler (just back from a sabbatical), are at a loss for suspects, even though good samaritan Leslie Blade and one prostitute's abusive boyfriend are being looked at. Meanwhile, Simon's sister, Cat, is still in mourning for her husband, Chris, who recently passed away. Cat is worried about how Chris' death is affecting their three children and wonders how she'll cope without the strong support system of her father and stepmother, Judith (who plan on spending a year in the U.S.). In The Shadows in the Street, Susan Hill has written another police procedural that will appeal to fans of Deborah Crombie, Ruth Rendell, and Elizabeth George.