Let me first say that Diane Duane is one of my favorite writers.
Ever since I first read her Star Trek novels in the 80's, I've
looked forward to her novels. Her keen sense of humor ran through
all her books, enhancing the experience.
This book's plot is old and very simple (yet another fantasy book
with a "mysterious dark force" as the menace...). Also, as a person
who likes both dogs and cats, I found the pro-feline writing got on
my nerves a lot. If you love cats, you would probably enjoy that
more than I did.
I'm not bothering with the sequel to this one. I see Duane has
written some more Trek novels, I might try those.