Thief is a stealth-action game where players assume the role of Garrett, a master thief navigating through a dark, oppressive city. The game emphasizes stealth, with players needing to carefully plan their approach to each mission, avoiding guards and traps. The environment is richly detailed, offering numerous paths and methods to achieve objectives. The story involves a mysterious plague and a conspiracy that Garrett uncovers as he steals valuable items. The game received mixed reviews, praised for its atmosphere but criticized for its story and mechanics.