Before I Go to Sleep is a psychological thriller film directed by Rowan Joffe. Anne-Marie Duff plays Claire, a close friend of the female protagonist, Christine Lucas. The film follows Christine, who suffers from anterograde amnesia, as she tries to uncover the truth about her past. Anne-Marie Duff's portrayal of Claire adds intrigue and suspense to the narrative, as her character holds key information that could unlock the mysteries surrounding Christine's condition. Before I Go to Sleep keeps viewers on the edge of their seats with its gripping storyline and compelling performances.