Okay, I read "The Eight," by this author, and I have to say, it was one of my favourite books, hands down, ever. "The Magic Circle," really really really fell short of that. Now, granted, I listened to it abridged on four audiocassettes, but it just didn't... flow.
Basically, the tale is thus: Ariel Behn, daughter of a really complex family structure, inherits something when her half-blood cousin (maybe) is killed, and that something might get her killed. So when her gypsy/german/rom/aryan/aboriginal/you-name-it various half-incest-inbred-orphan relatives come out of the woodwork to try and stop her / lie to her / mislead her / confuse her / rob her / seduce her, she's left confused.
So is the reader. By the third time you find out that the people she thought were her grandparents aren't, or that her lover is actually the half-brother of her cousin's uncle, who raped his maid before forcing her to marry him... yadda yadda yadda. It gets old, fast. And the notion of the various texts and manuscripts that Ariel is researching that might lead to some astounding knowledge just don't get enough play-time. In "The Eight," it was the pieces of the chess set, and the rich history, that was interesting. In "The Magic Circle," it just didn't work.
If you like multigenerational family (melo)dramas, it might be your thing, but for me, this just fell a little flat.