297X: Secret Code, Tunnel To Underground Station

I read this in the late 1950s or early 60s. Two or three children are sent to stay at a relative’s or ancestor’s house. The plot involves solving a code in which vowels are rearranged or relocated so that “Underground Station” encodes as something like NDRGRND STTN. The message and the plot involve a tunnel, the ends of which are called underground stations.

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