Travellers board a flight, unaware that other passengers might be spies and counterspies, complete with secret documents, poison and elaborate plans to engage in international espionage!

A 12-episode serial in which scholastic sports star Frank Merriwell leaves school to search for his missing father. His adventures involve a mysterious inscription on a ring, buried treasure, kidnaping and Indian raids. He saves his father and returns to school just in time to win a decisive baseball game with his remarkable pitching and hitting.

At the Golden Trail saloon in Alaska, Dave Langdon meets chorus girl Faro Kate who reminds him of his long-lost love, Jane Sunderlin. Meanwhile, back in the States, Harry Teal, scheming to steal a mine claim, hires Jane's brother Dick to do his dirty work in Alaska. After Jane accompanies her brother up North, Teal, who has designs on Jane, begins to fear that she will go back to Dave and so plots to discredit him by igniting the jealousy of Kate's admirer, Jim Sykes. Teal succeeds, and in the violent fight that erupts between Dave and Sykes, Sykes is shot by an unknown hand. While pursuing Sykes' assailant, Dave discovers Jane, but their reunion is cut short when Dave is arrested for the shooting.