Unexpected explosions and mysterious deaths have delayed the construction of the Central and South London Underground Railway. A crisis is brewing as the neighborhood is up in arms about the tunneling and the city is breathing down the contractor's neck to get the work done on schedule. The Baker Street Brigade discovers that the nephew may be the errand boy for an unsavory conspiracy. The boys look for ways to sneak in and hunt for clues. How can they get past the guards? What were the papers that the nephew was delivering? Could one of them apply for a construction job and discover the truth?
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