Sophia and Jason are two beloved siblings. On the surface, they seem like all other children their age. However, what no one knows is that in their free time, they travel through space and time solving... MATHEMATICAL MYSTERIES. With them, they always have their favorite insect-robots, Plus and Minus, who analyze the data and help them make the right decisions.

In this original book, children follow Sophia and Jason on their exciting journeys and offer their help in solving the mysteries, while at the same time making a methodical and fun revision of the class material.