Scientists, especially geniuses, often behave differently from ordinary people. They are completely immersed in their calculations or experiments, not noticing anything around and not thinking about loved ones who worry about them. Detectives Ethan, Ann and Andrea are investigating a missing math named Harold. Relatives and colleagues reported his disappearance. He did not come home and was not at work, the scientist disappeared somewhere along the way. Perhaps, thinking, he turned in the wrong direction and drove in unknown directions, but there is a version that he could be stolen. It is necessary to work out all versions in The Moment of Proof and find the missing mathematician.