[Transcriber Note: This etext was produced from IF Worlds of Science Fiction January 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] The disappearance of John Henderson was most spectacular. It occurred while he was at the blackboard working an example in multiple integration for his ten o'clock class. The incompleted problem remained on the board for three days while the police worked on the case. It, a wrist watch and a sterling s

The police searched his room in the nearby Vanderbilt Arms Hotel. They turned a portrait of the missing math professor to the newspapers to publish. Arbright University offered a reward of one hundred dollars to anyone who had seen him. The police also found a savings pass book in his room. It had a balance of three thousand eight hundred and forty dollars, which had been built up to that figure by steady monthly deposits over a period of years. It also had a withdrawal of three hundred and twen