Like many of Andre Norton's novels the main character is uncertain of his origin, is at a crossroads in his transition to adulthood as to what coarse in life he will take and he is thrust into conflict that he does not know all the hidden reasons and motivations for. All in all the book lives up to the sense of wonder you'd expect from a novel by Norton. It's more like her earlier works which I prefer over her latter ones.
Has all of the expected elements of a Norton SciFi novel:
Examples of PSY powers by a few of the charicters
An assumed galaxy wide civilization
A mystical link to some ancient artifact by the main charicter
A partnership between Aliens/Humans/Animals.
On a personal note I've been a fan of Norton's work for about 40 years now, yet I'd never heard of this particular novel till I saw it listed here.
young man from brotherhood of asassins and bodyguards is cast out on his own to wander a treacherous world. he is blood oathed to a gentle reptilian zacathan to seek a window into time and space. andre norton is always good sci fi