The "Lamb of Columbia" trailer builds off the two previous fake documentary videos released in the past couple of weeks that explores the legends of the floating city of Columbia. One of those is the mysterious "Lamb" who is Elizabeth; the girl that's been locked in a tower her whole life and guarded by the Songbird.
Here's the official description of the trailer from Irrational Games.
To clear his debt, Booker DeWitt must rescue a mysterious girl from the sky-city of Columbia. But who is this girl? What makes her so powerful, and why are so many willing to do anything to keep her from escaping? More importantly… what price will you pay to set her free?
You can watch the "Lamb of Columbia" trailer in our video gallery. "BioShock Infinite" is due out for the PS3, Xbox 360 and PC on March 26.