The Last Supper at Marrowbourne. Margot Fenn Mysteries, #1

A wife. A poisoned husband. A house full of secrets. At Marrowbourne, beautiful things hide dangerous truths. For twenty-two years, Nora Ashworth has been the perfect wife - graceful, composed, quietly loyal to a husband whose charm concealed something colder beneath the surface. Behind the polished silver, candlelit dinners, and sprawling gardens, their marriage has been quietly unraveling for years.
Then, after an elegant dinner party on a storm-soaked October night, Richard Ashworth is found dead in his locked study. The door was bolted from the inside. The windows were sealed. No sign of forced entry. No obvious suspect. And everyone inside Marrowbourne has something to hide. As Detective Margot Fenn begins unraveling the truth, she discovers a family built on performance, dangerous business secrets, betrayal hidden beneath luxury, and a marriage filled with quiet wounds no one dared speak aloud.
The grieving wife. The protective sister. The business partner with secrets. The assistant no one wants to discuss. And a dead man who may not have been as untouchable as he believed. But the deeper Margot digs, the clearer one terrifying truth becomes: someone inside Marrowbourne knows exactly what happened that night. Perfect for fans of Lucy Foley, Lisa Jewell, Ruth Ware, Freida McFadden, and "The Thursday Murder Club" with darker psychological depth, The Last Supper at Marrowbourne is an addictive locked-room mystery filled with shocking twists, emotional tension, buried family wounds, and a final reveal readers won't see coming.
Everyone came to dinner. Not everyone left innocent.