By secretly accessing the SWRB's computers using Gaither's old password (that only he would know), Tommy Walker (AKA: Augustin Gaither), alerts the SWRB that Gaither is still alive. So the SWRB comes after Gaither in full force, while the "Official's" Agency has to try to protect and hide him and themselves.
Did You Know?
To avoid the SWRB agents, Eberts says he was crawling through the air ducts, plus he is covered in dirt and down to only his undershirt and pants, a clear reference to John McClane in Die Hard
(1988). See more