String falls for the Czech woman scientist, whom he's helping defect to the west.
An agent is killed and Scott and Kelly look for the blueprints that he was carrying for a remote-missile guidance system.
Years after a top-secret fear-inducing gas is lost in an aircraft accident, a scientist in Yugoslavia is murdered after becoming terror-stricken. Professor Raven's daughter Marion flies to U.N.C.L.E. headquarters in New York to request help in finding out why her father was murdered. When Solo and Illya are put the case, they find they must assault an underground fortress to destroy the only example of the experimental gas that causes extreme fear!moreless