17 seems an arbitrary number, but if it keeps you focused, I’m all for it. And focus is what matters here. If you’ve got two storylines for two point of view characters, there should be some point of intersection for them—that’s where you focus your pitch. What’s the common denominator that allows these two people and stories to exist within the same novel? Do they speak to two sides of the question “What is love?” Do they explore the same theme and come to different conclusions about it? That theme is the anchor for your pitch, as in: “In a school where money means Everything, two freshmen find out what happens when Everything is suddenly gone.” What do you know! If you’ll let me ignore the word “a”, then I hit the magic 17.