If there is another novel out there that combines Wiccan rituals with recovered stolen Nazi treasure, I'd be interested to hear about it. Because wow, that was weird.
That being said, there's more than enough going on (and enough uncertainty) that the fact that I immediately identified the physical cause of the outbreak of insanity (mentioned in the book) wasn't a problem, aside from the fact that I couldn't believe Corinna didn't think of it.
The motivational cause was the difficult part. When it's all unraveled in the end, it turns out that delegating parts of one's villainy is, as always, not a good idea. Though actually not everything is unraveled at the end - it's never clear how or why the villain's actions were political as well as personal. Of course, Corinna's a baker, not a secret agent, so her point of view doesn't get to know about that.
Really, now that I think of it, I don't know that that part of the plot actually holds together - but the rest of it does, and anyway I enjoyed the ride, as always. Corinna and company might have been designed specifically for my enjoyment, in fact.
I'm less than thrilled, though, with the insertion of an unambiguous supernatural element in this one. Not that I mind supernatural elements in general, but I think the series has plenty going for it (and plenty going on) without adding that in. Even if it is popular.