Circle of Wives by Alice LaPlante
Detective Samantha Adams is thrown into a murder case that is intricately intertwined. Dr. Taylor was loved and admired, but he led a secret life. He was married to 3 very different women in 3 separate cities. When these 3 unsuspecting women show up at his funeral, suspicions run high. Adams finds herself tracking down a murderer through a web of lies and marital discord.