In 'Don't Believe It', filmmaker Sidney Ryan delves into a decade-old murder case for a documentary series, questioning the guilt of Grace Sebold, who was convicted of killing her boyfriend. As the series uncovers new evidence and achieves sensational ratings, Sidney becomes a star. But as she digs deeper, layers of deception unravel, putting everything at stake. Sidney must decide if revealing the truth is worth her career, her fame, and possibly her life, as the line between innocence and manipulation blurs.