Visiting Berlin headquarters in preparation for a high level U.N.C.L.E. conference, ""Summit Five,"" Solo finds agent Heinz Newman (Don Chastin) mysteriously murdered. Illya goes to Berlin, as does Harry Beldon (Albert Dekker), one of Waverly's counterparts in Section 1. Beldon suspects that either Solo or Gerald Struthers (Lloyd Bochner) committed the murder, while Illya suspects Beldon's secretary Helga Deniken (Suzanne Cramer), but Beldon himself turns out to be the traitor, and he plans to kill Waverly at the conference.