In the opera house, on the stage where the vaudeville performance ended, the announcer stepped onto the stage and introduced "Mr. Memory" Merrick. Borrowing amazing memories, Merrick answered all kinds of tricky and weird questions from the audience. Among the noisy crowd, Canadian man Hannah asked a question about Canadian geography, and "Mr. Memory" gave an accurate answer. Gunshots! Two gunshots caused the previously noisy opera house to plunge into chaos. The crowd flocked to the exit, and a strange and beautiful woman followed Hannah, squeezing out of the opera house in the crowd, and followed Hanna to the Brandt apartment where he was renting.
The woman, who called herself Smith, was employed by a British spy agency and was tracked by strangers for protecting the British Air Force’s air defense secrets. Smith's task was to travel to Scotland to join a man who had a missing part of his little finger on his right hand. The man is the head of the secret spy organization "The 39 Steps". Through the curtains, Hanna did see two mysterious men standing under the wall outside the window. At night, Smith suddenly broke into Hannah's room, dropped the sentence "Quickly go! The next one will be you", fell to the ground and died with a sharp knife stuck in his back.
The death of Miss Smith made Hanna feel terrified and then puzzled. With fear and doubt, Hanna escaped from the hotel, boarded the train, and headed for Scotland. On the train, Hanna read from the newspaper that the police had found Smith's body, but he became a murderer and was wanted by the police. The informant of the strange woman made the police arrive upon hearing the news. Hanna swiftly left the police chasing off, jumped off the train, and came to a farm in Scotland.
The police followed. The greedy farmer sold Hanna to the police, but the kind peasant woman gave Hanna a way out. Hannah was still chased by the police after climbing over mountains, crossing ridges, wading through water, and cutting thorns. At this time, Hannah found Professor Jonah’s villa according to a map left by Smith before his death. It coincides with the Bacchus Festival. Jonah cleverly dismissed the police, revealing "the true face of Lushan". Hannah discovered that Jonah turned out to be the person with a missing little finger that Smith said, and Smith's real name was Anna Bella.
What happened next became more convoluted, and Hannah's situation became more and more dangerous. When Hanna found out that air force secrets were related to the secret espionage organization "The 39 Steps", he was already at the Opera House after returning to London. "Mr. Memory"'s answer reminded Hannah. It turned out that the espionage organization wanted to use the astonishing memory of "Mr. Memory" to bring air force secrets out of Britain. The truth was revealed at the last moment, and the innocence was washed away at the last moment. Professor Jonah was revealed at the last moment, but "Mr. Memory" used his life to protect national defense secrets at the last moment
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