This is my first Andre Norton book, which I picked up due to some familiarity with the author as one cited in Gary Gygaxs' appendix N. The only other science fiction story I have read is Dune.
I have mixed feelings on the book. The most glaring being the political stances the book posits; the titular reptilian "monsters" are the native people of the setting, who have been oppressed by an ever expanding human empire. There is a movement in the empire to reverse the effects of colonization, and these activists are shown as being bleeding hearts with no common sense. The protagonist is highly xenophobic towards the reptilian natives, continuously referring to them by a term identified as derogatory in universe (crocs) and being equal parts terrified and disgusted by them, seeing it as no surprise when the "primitive" race turns violent against the humans (nevermind the fact that these humans took control of the reptilian homeworld and made many of them indentured servants). Its so on the nose that I cant help but wonder if this is meant to be satire.
Beyond my issues with the political implications of the story, it felt like chunks of text were missing, at least with my particular copy. The sample text on the first page involves the main protagonist discovering the dead body of an important character; as far as I can tell, this particular excerpt doesnt exist within the story, and the discovery of the body happens almost offhandedly, in a totally different way. Along with this, there doesnt seem to be a direct run in with the reptiles, which I found disapointing. They are rarely "in frame" and when they are, they do almost nothing exciting.
However, when they are out if frame they are very effective. Their cunning intelligence and their methods are slowly pieced together through environmental evidence, which I thought was very neat. They end up feeling like a pervasive threat that could leap out at any moment, but never really do. For the most part their lingering scent and the havoc they reek are all we see of them until the very end. I just wish we could have gotten more direct engagements with them, because I love lizard people!
Overall this book is very good at getting your imagination going. Flora, fauna, and exotic technology are given little to no description beyond a evocative name ("Ghost Wing" for a transluscent bird/insect creature). This works, and leaves alot of space for the reader to develop their own mental image of these things. Ask some artists to illustrate them and they would all come out wildly different. The book is also a super quick read, a good little summer escapade. I think young readers would get a kick out of this book, but some discussion on the themes involving irrational hatred towards whole races would probably be a good idea.