From the web site:
Gosh, Spies! is 120 pages of information for your Agents of SWING games, expanding the scope of the game into the realms of Saturday Morning Adventure cartoons with a particular emphasis on girl’s adventures.
The book has information and ideas on running SWINGgames for children and particularly for girls. While the book itself is not necessarily for kids and younger teens, it should help you create and run games for them.
More generally Gosh, Spies! contains rules for creating child characters, some new child/teen oriented stunts, background for two boarding schools, information on the teen subcultures of the 60s and 70s and an introductory, Saturday Morning style adventure called ‘Field Trip’