By David Herter.
I have to say I agree somewhat with the sfsignal reviews (two links): this book does not explain a whole lot. The author has announced his intention to write two or three more books related to this one, but doesn't seem to have produced any output in the last five years or more, so it's questionable whether we'll ever see them.
However, I think the comparison to The Sword in the Stone on the back cover is rather apt: this is a story like The Golden Age where the technology is basically magic. Daric, the young protagonist (hero is too strong a word), is on a bewildered quest of some sort, except that it doesn't really seem to be his quest. There are magic rings that let him breathe in void and a magic cloak that protects him (albeit not very well) and doors between the planets of the solar system that his forebears used to survey their domain, not to mention ghosts and century roses and telepathic spores that dream of the world they came from.
Still, this book is a lot of work reading between the lines, trying to figure out what Daric doesn't realize or know or even care about, and while it ends at a sort of natural breaking point, I wouldn't call it concluded. I won't say it was terrible, like the second sfsignal review, but it lacks substance in some important ways.