Description from Google Books:

From the #1 bestselling author of Turtles All the Way Down and The Fault in Our Stars Michael L. Printz Honor Book Los Angeles Times Book Prize Finalist New York Times Bestseller When it comes to relationships, Colin Singleton’s type is girls named Katherine. And when it comes to girls named Katherine, Colin is always getting dumped. Nineteen times, to be exact. On a road trip miles from home, this anagram-happy, washed-up child prodigy has ten thousand dollars in his pocket, a bloodthirsty feral hog on his trail, and an overweight, Judge Judy–loving best friend riding shotgun—but no Katherines. Colin is on a mission to prove The Theorem of Underlying Katherine Predictability, which he hopes will predict the future of any relationship, avenge Dumpees everywhere, and finally win him the girl. Love, friendship, and a dead Austro-Hungarian archduke add up to surprising and heart-changing conclusions in this ingeniously layered comic novel about reinventing oneself.

Snippet from Google Books:

From the #1 bestselling author of Turtles All the Way Down and The Fault in Our Stars Michael L. Printz Honor Book Los Angeles Times Book Prize Finalist New York Times Bestseller When it comes to relationships, Colin Singleton’s type is ...

Description from Harvard Library:

Having been recently dumped for the nineteenth time by a girl named Katherine, recent high school graduate and former child prodigy Colin sets off on a road trip with his best friend to try to find some new direction in life while also trying to create a mathematical formula to explain his relationships.