From Postmortem's blog preview:
Gosh, Spies! is a supplement for Agents of SWING and will expand the SWING world into the realms of children’s, tweens and teens adventure fiction, drawing on such diverse sources as Enid Blyton, Hanna Barbera and ‘Keene’/'Dixon’ as well as later skits and reinterpretations of the same ideas and characters, giving our own spin on them.
As well as a catalogue of pre-generated characters from these sources you’ll get rules expansions for making youthful characters, rules changes for running child-investigations, suggestion on how to run games for a younger audience – particularly girls and a bunch of background information on SWING’s younger agents, their training and the boarding schools where they teach them to be spies.
Essentially, Gosh, Spies! will provide you with a bunch of characters and villainous organisations suited to the sub-genre (though I’ll try to avoid ‘Gypsies’ as a villainous group) and a whole lot of expansionary material. We thrive on feedback here at Postmortem Studios though and would love you to let us know what material you’d like to see come out for Agents of SWING besides the planned ‘Nefarious’ villains book, Gosh, Spies! and the as-yet-unnamed gadget catalogue.