Rachel Blumenfield-Goldenfeinberger has never taken a risk in her life. A devoted student of statistics, she knows when the odds are stacked against her. But when her professor, tutee, classmate, and grandmother each challenge her to be open to life's possibilities, she knows that something's gotta give. "What do you want me to do?" she asks. "Go on a date?" Oy gevalt, but it's a start. As Rachel discovers the unpredictability of the world, she approaches her obstacles in the only way she knows how: with rules, logic, and the laws of reason. Will her meticulous plan work? Maybe not. She might just realize there's one pesky variable that has a way of skewing everything: chance.