An Abundance of Katherine’s by John Green

I am catching up on some Young Adult fiction, and John Green is my all time favorite in this category, if you take away JK Rowling, which I think is a given.  Or at least he is my second or third favorite, and he is still writing for the youth audience, which is a big plus. This book offers an offbeat, but ultimately wise, perspective on failed romance, even as it explores the challenges, hilarity and occasional moments of beauty on the path to adulthood.
At the book's core is Colin, a recent high school graduate and former child prodigy who attempts to apply mathematical principles to his checkered romantic history. Colin is determined to prove The Theorem of Underlying Katherine Predictability, which will help him understand why he's been dumped by 19 girls named Katherine.  His friend Hassan agrees to go on an epic road trip (which lasts only about a day, when they stop in a town and basically get stuck there) where he meets a girl who is not named Katherine who opens up a whole new chapter in his young adult life.