Kass Baptiste is newly engaged to her fiancé Murray Sedgemont after a whirlwind romance. Before they even get to share the news, an invitation arrives via messenger - to an engagement party hosted by Murray's parents. When Kass and Murray arrive at the Sedgemont Estate, she is astonished to learn that Murray's family is one of the most powerful families in North Carolina. As Kass's future mother-in-law, Beatrice, whips herself into a frenzy over the perfect party for the state's elite, Kass begins to receive anonymous threatening social media messages.

On the night of the event, as champagne is popped and the celebrations begin, a body is found in the lavish home. All eyes are on Kass, the interloper amongst the rich and powerful guests. Over the course of the party, Kass's dark past unexpectedly becomes intertwined with the murder, and in order to prove her innocence, she must finally come to terms with her secrets.

As Murray's family secrets are revealed, Kass must prove herself innocent while evading the anonymous threats that haunt her every move.