What is found under the ground of an old tenement building on Catherine Street? Why did the construction workers dig that deep? Why was this structure left behind after the building above it burned to the ground and was later rebuilt? What did this structure once house? What was found in the structure? Who used this material for personal purposes?

Who is Nora Kelly? Where does she work? What does she want more money from her bosses for? Why does Nora not get what she wants? Why does Nora begin working with Special Agent Pendergast? Why does Nora not want to work with Pendergast at first? What does Nora find that draws her into Pendergast's investigation? How does this investigation lead Nora to be held captive? By whom? For what purpose?

Who is Bill Smithback? What is his occupation? How does Bill use his...