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Early one morning Mr. Webster sends a letter to Art and Mrytle telling them that he is a member of the Royal Xenological Institute and he wants to meet with their father.
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The next morning the spiders come to Larklight and try to capture Art and Mrytyle, but they escape using the lifeboat. While they were escaping, their father was captured by the spiders and they could not return to him.
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After they got on the lifeboat and escaped Larklight, Mrtyle and Art landed on the moon. On the moon they encounter a giant moth that traps them in a jar to feed its young
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After being saved on the moon by the pirates, Art and Myrtle are now part of their crew.
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People think that Jack is a murderer, even though he isn't, so they have to go into hiding.
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The crew gets ambushed by siders and they take Myrtle hoping that she has the key to Larklight.
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Thunder head is a powerful spirit that knows all and Jack and Art are going there to ask about the spiders.
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Art and Myrtle go with Jack and his crew into the spider's base and destroy it. They esacape and go back to Larklight.
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Once they get back to Larklight they find out the mother was a shaper. The house was her spaceship and they went to destroy the robot spider in Britian.
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They travel with Larklight to go destroy the giant robot spider. They go destroy the spider and save the British kingdom.
