I've read this 3 times and its one of my very favourite books. I love the use of language, which is beautiful without ever feeling like Mckillip was trying too hard, or trying to be clever. Based on this series, along with Forgotten Beasts of Eld, and Ombria in Shadow, Mckillip is my second favourite SFF author. (Although I've not been as impressed with quite a few of her other books, so she may have slipped a few places.) I haven't reread yet, so wont comment on the plot.
This paraphrased is from Clute's entry in the encyclopedia of fantasy:
The Riddlemaster Trilogy is an orthodox but stylish heroic fantasy and is similarly well wrought [as ForgottenBeasts of Eld]. The intellectual and emotional maturation of its mild-mannered hero and independant-minded heroine are handles with scrupulous delicacy.
It has been argued by Peter Nicholls that the trilogy is a work of classic stature; the intricate narrative of its quest story echoes a moral complexity almost unheard-of in fantasy trilogies; Mckillips protagonist has a special skill at unravelling riddles and, through a series of strategies (including subliminal hints as little obvious as leaves in a forest) not unlike those adopted by Gene Wolfe in his Book of the New Sun series, she forces the reader also to become a decipherer of codes. Thus the book's meaning is enacted by the way it must be read.
While in no way resembling SF, the trilogy contains one of the most sophisticated uses of the shapeshifter theme to be found anywhere in SF or fantasy.
Mckillip is one of the most accomplished prose stylists working in the fantasy genre; she always brings a keen and refreshingly idiosyncratic intelligence to her employment of its motifs.
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I had never thought of Wolfe and Mckillip being similar, but maybe this is why they are my 2 favourite authors?
btw, there was a
thread on this series a while back in the main forum, which i guess might be useful to spark discusion or quote from, although mostly ppl just said they loved it.