Inventing a formula to predict people's perfect partners doesn't equate to love in this contemporary YA 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...