Murder in Montmartre. The Maggie Newberry Mysteries, #24

Make new friends, but maybe don't kill the old...? After twenty years living in France, Maggie's proud of her language skills and her ability to adapt to a foreign culture, so when four women from her Atlanta high school invite her to get together for a mini reunion in Paris, Maggie can't wait to show them how she's changed. Unfortunately, after two awkward days and a miserable Seine River tour Maggie realizes what she should have remembered-three of the four girls were never really nice to her in high school-and the fourth one didn't know she existed.
Everything changes dramatically however, when, on the morning that Maggie decides to leave early, one of her friends is found brutally murdered in her hotel room. The police suspect the killer is one of the four surviving friends with Maggie's name topping the list.  Determined to prove her innocence, Maggie plunged into the secret pockets and hidden quarters of Montmartre and the nontouristy parts around the Sacre Coeur to find out the truth.
In the process she discovers that each of her friends had reasons for wanting Christy dead. As suspicions deepen and tensions rise, what started as a fun reunion in the City of Light, becomes an intense game of life-and-death as Maggie races to unmask the killer and the decades-old secret that drives her-before she kills again. Murder in Montmartre is a riveting international whodunit about the snarled perceptions of old friendships, and the treasures - and tragedies - that can arise when a terrible past that won't die collides with the lies of the present.