I am grateful to Dr. James E. Keirans and to the late Larry L. French for material on Dr. Fell which appears in this introduction.

Series Consultant Douglas G. Greene is Director of the Institute of Humanities at Old Dominion University. Dr. Greene is working on a multi-volume history of the detective story. He has edited two anthologies of John Dickson Carr's work, and is widely recognized as the authority on that writer.