And the kids left in a secret train stop in the middle of the most travelled train station.
They were put out by the Stratemeyer Syndicate, which also did the Hardy Boys and Nancy Drew. The original editions of those books were a lot better than the rewritten versions, to remove racial stereotypes, big words, and the more interesting villains and ambiguous authority figures.
And left for a boardng school run by an old man who asks all the kids if they want to see his ‘elder wand’.