When you're 16 it's supposed to be you against your world history test, you against the mean girl, you against your fear of rejection by the cutest guy ever. For best friends Flynn and Nora, these are battles they fight every day. But they aren't the only problems they face. Due to an experiment gone wrong, they have much, much bigger fish to fry. They're going to need the help of all their friends, above water and below, as well as a few new ones,...