Kills Well with Others by Deanna Raybourn (Author)

After more than a year of laying low, Billie, Helen, Mary Alice, and Natalie are called back into action. They have enjoyed their time off, but the lack of excitement is starting to chafe: a professional killer can only take so many watercolor classes and yoga sessions without itching to strangle someone...literally. When they receive a summons from the head of the elite assassin organization known as the Museum, they are ready tackle the greatest challenge of their careers.