Hm. The last book I bought, not a series yet, was called Emmy and the Incredible Shrinking Rat. I've read it, and I found it quite interesting. It's about a rat that's very rude, and bites people. But when he bites them, they begin to understand rat dialect. (How wierd is that? owO) And on the second bite, dare he, they shrink. Down to the size of a Barbie doll.
It was a very strange book.