Act as a seasoned screenwriter with a background in crime thrillers and psychological dramas. Develop a high-stakes heist plot where the crew members gradually turn on each other due to [greed], [mistrust], and [hidden agendas]. Start with a detailed setup of the heist—targeting [a high-security vault in a luxury casino]—and introduce each crew member with their unique skills and personal motives. As the heist unfolds, weave in subtle clues that hint at growing tensions, leading to a dramatic betrayal scene where [the mastermind is double-crossed by their most trusted ally]. Ensure the dialogue is sharp, the pacing is tense, and the climax leaves room for a twist, such as [an unexpected third party swooping in to claim the prize]. Focus on character-driven conflict and moral ambiguity.