In the first of the stories about the two-centimeter demon Azazel, “Just One Concert,” the regular hero of the series, George, because of his characteristic mercy, helped his friend Andrew Mortenson, who was given a turn by his girlfriend. She sang in the church choir and Andrew asked Azazel to give her the perfect voice for three hours. When she started singing after that in the evening, it was so divine that when three hours had passed, it was a real blow for her. How cruel the revenge turned out to be...