Horror legend Boris Karloff stars in this rarely-seen mystery tale, directed by Daniel Petrie (A Raisin in the Sun, Sybil) . Sidney Silchester, a college professor, is enjoying a summer holiday in a quiet English village. His peaceful vacation turns into a nightmare when the town is invaded by a swarm of killer bees. One of the few to escape, Silchester finds refuge with an elderly recluse, ""Mr. Mycroft"". With the old man's help, the academic discovers that the bees were let loose by a mad killer. As the two men close in on the lunatic, Silchester realizes that Mycroft is no ordinary retiree, and in fact may be the greatest detective of them all.