The gang travels to the secret Pole Position Headquarters in San Francisco in search of the missing Uncle Zachary. At the headquarters they find Alfred McGuffin, international industrialist, who leads them on a wild goose chase for Uncle Zachary. Before long the police are chasing after them in connection to the kidnapping of Uncle Zach. They sneak back into the headquarters and find a tape of Zach talking to a man named O'Connor but he's the man they know as Alfred McGuffin. They also find a Chinese puzzle box left as a clue by Uncle Zach with a rock inside. The kids decipher the clue to mean he was taken to Alcatraz and they are off to the rescue. After freeing Uncle Zach they track down McGuffin, who kidnapped Uncle Zach when he figured out McGuffin was also a spy known as O'Connor.
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