Plot summary

During their father's investigation of the ruthless Scorpio gang of terrorists, the Hardy Boys witness an explosion and an elephant falling from an airship named Safari Queen of Quinn Airport which was carrying animals of the newly opened Wild World Zoo. Strange events are happening at Wild World, so the Hardy Boys search for the truth. They fall into a trap and almost escape injury. They capture the gang in an all-out fight.The leader of the gang is Eustace Jarman.

• Publication date: 1979
• Ghostwriter: James Duncan Lawrence
• Summary: As their father investigates a gang of terrorists, the boys find clues in an airship company and a newly-opened zoo.