Pexels/cottonbro studio Movie Starring Sydney Sweeney, a star-studded cast brings Edith Wharton's classic novel to life. Undine Spragg climbs New York's ruthless social ladder. March 20, 2026 AceShowbiz - The Custom of the Country, the upcoming film adaptation of Edith Wharton's 1913 novel, is currently in production and has assembled an impressive cast with actors from acclaimed series such as Game of Thrones, The Wire, and Hannibal. Leading the cast is Sydney Sweeney, who stars as Undine Spragg, a "new money" Midwestern woman determined to secure an "old money" husband in New York City.