Vacation on Union Station — E.M. Foner

Start series with the first book, Date Night on Union Station The Wanderers have just moved on from Union Station and the ambassador is ready to take her first vacation in fifteen years. Unfortunately, the rules on paid vacation for EarthCent employees have changed for the worse, retroactively. Libby suggests spending some time exploring the station as an alternative, and Kelly cautiously goes along with it. Back at the embassy, while the cat's away, the mice will play.