Ratscalibur by Josh Lieb is at the intersection of Arthur and the Invisibles and Sword in the Stone. Joey and his mother have moved to New York and are trying their darnedest to adjust to a very different life. That is until a magical talking rat gets in, bites Joey and turns him in to a rat!
There's an ancient battle brewing among the city creatures of New York City. For readers familiar with the classic fantasy (like King Arthur, the Lord of the Rings, etc) will recognize the inspirations for this story.
But this one is also its own tale. It's not just a retelling. Lieb offers up a new explanation of how *agic works and how different animals can use it. Magic is mankind's version, for example.