An Abundance of Katherines, by John GreenRead about another entry on the list.
What do you do when you’ve been dumped by number 19 in a string of Katherines? Go on a road trip with your best friend, of course. Before you know it, Colin and Hassan have found themselves in Gunshot, Tennessee, staring at the grave of Archduke Franz Ferdinand. But along with the romance and history and wacky best friend moments that are key to a good road trip, Green adds something else, something magical: math. Proving you can, in fact, use math in real life, Colin is building a relationship equation. This book is totally worth a read just for the math appendix alone.