The Spy In The Pyramid

Published in Ellery Queen Mystery Magazine, (US - Sep. 1972), then in Argosy (UK - Mar. 1973). Reprinted in the collection Tales of Espionage and in the collection The Old Spies Club.
Rand is asked to investigate possible Russian activity at the Great Pyramid of Cheops, where an archaeological dig is underway. He reunites with Leila, an archaeologist he previously worked with.