The first Shaver Mystery story, "I Remember Lemuria", by Richard S. Shaver, appeared in the March 1945 issue. Shaver claimed that all the world's accidents and disasters were caused by an ancient race of deros (short for "detrimental robots") who lived in underground cities. This explanation for the world's ills, coming towards the end of World War II, struck a chord with "Amazing"'s readership. Palmer received over 2,500 letters, instead of the usual 40 or 50, and proceeded to print a Shaver story in every issue. The June 1947 issue was given over entirely to the Shaver Mystery. From March 1948 the Shaver Mystery was dropped as a regular feature of the magazine, at Ziff's insistence. Palmer left the following year, and Browne, his successor, "was determined to make sure that the lunatics were no longer in charge of the asylum", in the words of science fiction historian Mike Ashley.