Originally intended as a tie-in for the Top Secret RPG, this series of books was re-themed after TSR's acquistion of game publisher SPI. TSR wanted to use the publication of these "choose your own adventure" books to support their release of a second edition of SPI's Sniper! wargame.
In this series, the reader is a covert operative, usually in a modern setting (as of the 1980s), with a complex mission to accomplish. There is a strong spy/espionage flavor to these titles.