Amelia Sachs is marrying into one of Nantucket's wealthiest families. Her future mother-in-law, the famous novelist Greer Garrison Wimberly, is critical of the marriage, but she's still willing to spend big on the biggest wedding of the season—until a body turns up on the beach. As secrets come to light, a real-life investigation unfolds, one that feels like something out of Greer's novel. Suddenly, everyone is a suspect. Nicole Kidman (A Very Family Affair, The Ricardos) plays the groom's mother, Greer Garrison Wimberly. Liev Schreiber (The Scavengers, Asteroid City) plays the groom's father, Tug Wimberly. Eve Hewson (Flora and Son, The Bad Sisters) plays the bride, Amelia Sachs. Billy Howle (Under the Banner of Heaven, The Serpent) plays the groom, Benji Wimberly. Dakota Fanning (Once Upon a Time in Hollywood, the upcoming The Equalizer 3) plays sister-in-law Abby Wimberly. Meghann Fahy (White Lotus Resort, Fearless) plays the bride's best friend Merritt Monaco. Ishaan Khattar (Up in the Air, The Right One) plays the groom's best friend, gunman Dewar. Jack Reynor (Midsommar, RimWorld) plays the groom's brother Thomas Wimberly. Sam Nivola (Master of the Arts, White Noise) plays the groom's brother Will Wimberly. Mia Isaacs (Not Good, Black Cake) plays the police chief's daughter Chloe Carter. Donna Lynn Champlin (Crazy Ex-Girlfriend, The First Lady) plays Detective Nikki Henry. Isabelle Adjani once again plays family friend Isabelle Naray.