BioShock Infinite is an upcoming first-person shooter video game and the third installment in the BioShock series. Previously known as "Project Icarus", it is being developed by Irrational Games for a March 26, 2013 worldwide release on the Microsoft Windows, PlayStation 3, and Xbox 360 platforms. BioShock Infinite is not part of the storyline of previous BioShock games but features similar gameplay concepts and themes. Set in 1912 during the growth of American Exceptionalism, the game's protagonist, former Pinkerton agent Booker DeWitt, is sent to the floating air-city of Columbia to find a young woman, Elizabeth, who has been held captive there for the last twelve years. Though Booker rescues Elizabeth, the two are pursued by the city's warring factions; the nativist and elite Founders that strive to keep the city for pure Americans, and the Vox Populi, a rebel grouping representing the common people. Booker finds Elizabeth to be central to this conflict, and that she also holds strange powers to manipulate rifts in the time-space continuum that ravage Columbia.