So, this is the other Jack of Fables. After saving all of existence, Jack Horner has entered a kind of retirement. But his son, Jack Frost, is still wandering around the Fable worlds, trying to make a name for himself as a hero. This is a disconnected-from-everything-else book about that.
The Fulminate Blade is a literal thing, a kind of lightning sword that is the only thing that might kill a giant in the sky who stands accused of stealing gold and virgins from the kingdom below. You know that time (not pictured in any particular Fables book, but well known I think within the fables themselves) when Jack Horner climbed a beanstalk and fought a giant over an egg-laying goose with a chemical imbalance? This is like that, but a) science-fictional more or less? Amazon says it’s the far distant future of the world of Buck Rogers and Flash Gordon. That may be true? I can find no evidence of it in the text, but as guesses go: sure, it could be. Why not? …and b) with a lot more intrigue, from every direction.
Unrelated to any of this even moreso than any of this is unrelated to the rest of the Fables storylines: I’m pretty much done with Walter Mitty the miniature Blue Ox. Even one page per issue is two pages too many. Luckily, the Jack of Fables spinoff series is wrapping up soon!