St. Louis Stake Out
Gary Friedrich (writer), Luis Dominguez (artist)
The second mission starts quite like the first when Tiffany Sinn is kidnapped by the CIA for another job, this one to find Rex Swift's younger brother, Alfred, suspected of being a member of the Nazi Party (in 1967). Sinn's job is to find him in St. Louis and "dispose of him".
Note: this was obviously a two-part story with the conclusion promised in the next issue but never produced. The ending, though, was told in a short flash-back in the third and final adventure.
Here are the pages I have of it.