Can The Black Dinosaurs go back in time to the Underground Railroad?
Well, Ziggy, Rico, Rashawn, and Jerome don't exactly go back in time, but they do discover an old tunnel that was one of the safe heavens used by escaped slaves. And it all started with the map.
Ziggy thought it'd be cool to see where the old map would lead. Especially since it showed a hidden trapdoor and a secret passageway right under their own school! Ziggy and his friends would just check it out. They wouldn't even have to tell anyone. No problem. Right? Wrong. Because they realize they're in big trouble when the trapdoor gets stuck and they're forced to use the old, dark, damp tunnels just like the escaped slaves did before them. And what about the legend of the River City Ghost - are the tunnels haunted? The Black Dinosaurs have to think of something soon or they may be trapped in the past forever.