Vesper Lynd is a fictional character from the James Bond film series, specifically featured in the 2006 movie Casino Royale. She is portrayed by actress Eva Green and serves as a British Treasury agent who becomes a love interest for James Bond. Vesper is known for her intelligence, charm, and complexity, playing a crucial role in the plot as she assists Bond in a high-stakes poker game against the villain Le Chiffre. In the film, Vesper's character is central to Bond's emotional development and the overall narrative. Her backstory reveals a troubled past, which adds depth to her relationship with Bond. Ultimately, her actions and choices significantly impact the storyline, leading to themes of betrayal and trust within the espionage world.