BioShock Infinite is the third game in the BioShock series set in 1912. The player takes on the role of Booker DeWitt, a former detective hired to rescue Elizabeth, who has been imprisoned in the flying city of Columbia all her life. To escape, DeWitt must work with Elizabeth and utilize her abilities while navigating Columbia and battling various human and mechanical enemies pursuing their return of Elizabeth, including the robotic Songbird. The gameplay is similar to previous BioShock games with vigors that grant powers and weapons to defeat enemies on the ground and while riding the skyline rail system across the open-air city.