An Abundance Of Katherines by John Green

The novel follows Colin Singleton, a former child prodigy who is struggling to find his place in the world after being dumped by his nineteenth girlfriend named Katherine. In an attempt to overcome his heartbreak and prove his worth, Colin embarks on a road trip with his best friend Hassan. Along the way, they end up in a small town in Tennessee, where Colin works on a mathematical theorem to predict the outcome of relationships. Through new friendships and experiences, Colin learns about love, identity, and the unpredictability of life, ultimately discovering that not everything can be calculated or predicted.