Mona Gray is a 20-year-old loner who, as a child, turned to math for salvation after her father became ill. As an adult, Mona now teaches the subject and must help her students through their own crises.

Although strangers Sara and Jonathan are both already in relationships, they realize they have genuine chemistry after a chance encounter – but part company soon after. Years later, they each yearn to reunite, despite being destined for the altar. But to give true love a chance, they have to find one another again.