Do you have a tween at home? If you do, then chances are you’re going through the same thing as we were a few years back. The most common question that parents get is: What’s the best tween book series? It’s important to understand how essential reading can be for everyone. So, in order to help you out as much as possible and narrow down that list of books for your tween (or soon-to-be-teen), here are the six best tween book series.