Set in 1912 in a fictional floating air-city in Columbia, the player takes control of Pinkerton agent Booker DeWitt. He is sent to the floating air-city of Columbia to find a young woman, Elizabeth. She has been held captive there for most of her life. Though Booker rescues Elizabeth, the two are pursued by the city’s warring factions. Booker finds Elizabeth to be central to this conflict, and learns that she possesses strange powers to manipulate rifts in the space-time continuum that ravage Columbia.