Twenty of America's most cunning contestants, a mix of famous faces and everyday Americans, play the ultimate murder mystery game. Hosted by award-winning actor Alan Cumming at an ancient castle in Scotland, they will work together on exhilarating missions to build a prize fund worth up to $250,000. But hidden amongst the Faithful contestants are the Traitors, whose goal is to eliminate the Faithful and claim the prize for themselves. Under the cover of darkness, the Traitors will murder the Faithful one by one in a treacherous spree while the players try to uncover the Traitors and banish them from the game. If the Faithful contestants banish all the Traitors, they will share the prize fund, but if a Traitor makes it to the end, they will steal all the money.

Season 4  brings together a diverse cast of reality television veterans and well-known personalities, including Real Housewives stars Candiace Dillard Bassett, Caroline Stanbury, Dorinda Medley, Lisa Rinna and Porsha Williams, alongside familiar competition faces such as Colton Underwood from The Bachelor, Big Brother standouts Tiffany Mitchell and Ian Terry, and Survivor alumni Rob Cesternino, Natalie Anderson and Yam Yam Arocho. They are joined by singer-songwriter Eric Nam, Olympic figure skaters Johnny Weir and Tara Lipinski, Top Chef winner Kristen Kish, Dancing with the Stars professional Mark Ballas, Love Island personalities Maura Higgins and Rob Rausch, RuPaul’s Drag Race star Monét X Change, comedian Ron Funches, actor Stephen Colletti and actor Michael Rapaport, all competing in a game of strategy, deception and trust.