After a THRUSH attempt to kill Waverly is thwarted, Solo is assigned to prevent the assassination of a visiting African premier (William Marshall) at the hands of Andrew Vulcan (Fritz Weaver), and with the help of a housewife (Patricia Crowley) he learns that the premier himself is allied with THRUSH and plans to kill his two top aides (Ivan Dixon and Rupert Crosse) in a fake accident.

Solo uses hillbilly clairvoyant Clemency McGill to counter the efforts of Count Zark, a vampirish THRUSH agent who plans to use radioactive bats to jam the world's radar systems from his castle. Solo and Clemency make their way to the castle with Illya, but Zark manages to release the bats.

Solo and Illya protect Miranda Bryant, the wife of a presidential candidate, from a THRUSH plot to kidnap her, not realizing that she has already been kidnapped and replaced with a double Irina, an unwitting dupe of THRUSH. When they do catch on, the candidate, Senator Bryant and his aide Fairbanks, agree to play along but Fairbanks is the one behind the plot to put a THRUSH agent in the White House.