Nice. Somehow it remembered me about "The Golden Compass"
BTW. Have you read that trilogy ("His Dark Materials")? If not: I do not recommend
Only first book is really good. The third one is boring for most time, and the second one is just awful. But they are written that way that endings of I and II are not in any stable point... so you probably have to read next if started first
But it's quite interesting universe (or multiverse).