Katherine Waterston stars in the HBO Max series 'The Third Day'. The show is a psychological thriller that follows the story of Sam, played by Jude Law, who finds himself drawn to a mysterious island off the British coast. As he becomes immersed in the island's secretive rituals and traditions, he begins to question his own sanity. Waterston plays the character of Jess, a woman who also finds herself on the island and becomes entangled in Sam's journey. With its atmospheric setting and gripping storyline, 'The Third Day' is a must-watch for fans of psychological dramas.