This sourcebook doesn't bring anything new to the system. It contains information on the CIA and KGB (c. 1987) and a few dozen "espionage case files", which tell the stories of numerous spy-related cases.
Top Secret/S.I., G4 File: Guns, Gadgets, and Getaway Gear, Operation: Starfire, The Doomsday Drop, Covert
You only live twice: the JAMES BOND 007 game and the TOP SECRET/S.I. game.