A Circle of Wives by Alice LaPlante

Palo Alto police detective Samantha Adams is assigned to investigate the suspicious death of plastic surgeon John Taylor. Even though Taylor had a heart attack, he has a puncture wound on his shoulder. The police are also tipped off that Taylor had not just one wife, but three. He had been married to wife number one, Deborah, for over thirty years and they had three children. Wife number two, MJ, is an accountant, with whom he lived in Los Gatos. Helen, a pediatric oncologist, was much younger than John--they met when she asked him to consult on one of her patients. In A Circle of Wives, the reader observes the unfolding murder investigation and has a front row seat as all the secrets of each of the four women's lives are laid bare. An engrossing novel that keeps you guessing right up to the end. A great read-alike for Tana French's Broken Harbor and A.S.A. Harrison's The Silent Wife.  It will be published in March.