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to discover that their hometown was a stop on the Underground
Railroad. Even more exciting, their new friend Mr. Greene has
given them an old map that shows a secret passage, dating back to
the days of the Railroad, right under their own school! How can
the Black Dinosaurs resist making plans to check it out?
When a trapdoor slams behind them, locking them in the tunnel,
there's only one thing they can do -- plunge deeper and deeper into
the darkness. Where will the tunnel lead them? And will the old,
crumbling walls hold until they find their way to the end?