This book is no novel. This ain't fiction. A Vindication of the Rights of Woman is a straight-up philosophical treatise, one that Wollstonecraft wrote for a single central purpose: to show the world that women should be entitled to the same civil rights as men.
The book starts out by laying out its core premises, then moves outward to trace out all the implications of these premises. There's no "story" in the traditional sense here: this is an essay.