A visiting Soviet athlete vanishes during a practice run, and Ironside is placed on the case. It soon turns out that the 'trustworthy Soviet hero' is anything but, and that the athlete is working for American Intelligence. Has he simply disappeared, however, or has he been found out?

Ed goes undercover at the docks to try to identify and capture the murderer, whilst the rest of the team continue investigating the case. Finally, with a terrorist plot to defuse, a parade to protect, and Ed masquerading as the arrested murderer, Ironside has plenty to work on; but still has enough time to spend with his old girlfriend.