Inventing a formula to predict people's perfect partners doesn't equate to love in this contemporary novel that New York Times bestsellers Rachael Lippincott and Alyson Derrick call ""honest, raw, and breathtakingly real."" College freshman Grace Tang never meant to rewrite the rules of love. She came to college to move on from a grief-stricken senior year and to start anew. So, she follows a predictable routine: Attend class, study, go home, and visit her dad every weekend. She doesn't leave any room in her life for outliers or anomalies. Then, Grace comes up with an algorithm for her statistics class to pair students with their perfect romantic partners. Though some people are skeptical, like Julia, Grace's prickly coworker, Grace is confident that her program will take all the drama out of relationships. That's why she keeps trying to make things work with her match, a guy named Jamie. But as the semester goes on and she grows closer to Julia, Grace starts to question who she's really attracted to. In award-winning author Christina Li's Ya debut, Grace will have to make a choice between the tidy equations she knows will protect her from heartbreak or the possibility that true love doesn't follow any formula.