No one besides Zero will befriend Mark the little Minus Sign, or tell him what his talent is because they don’t want him to take away something they value. To Mark, it feels like all of the other children at school know their talents already; even Mark’s best friend, Zero, finds his!!! Through his vivid imagination at the prompting of Miss Story, an imaginary number, with her mysteriously blank book, Mark finds adventure, a new friend, and finally his true talent.