The Problem Solver and the Spy
Written by
Christopher Anvil
Copyright 1965
Printed in Ellery Queen's Mystery Magazine, December 1965. Reprinted in the collection
The case given Richard Verner deals with a technician at a highly classified research lab disappearing with plans for a new and secret type of laser device. The scientist who had come up with it was found dead. The missing spy, for what is what the client is certain the man was, was suspected of hiding out in a major cave system, being an avid speleologist. Verner is asked for a way of getting hold of the man in such a massive sequence of tunnels.