What does Nelly reveal to Edgar after escaping Wuthering Heights in Chapter 28? How does Edgar respond?

Nelly tells Edgar an abridged version of their imprisonment at the Heights, and Edgar, fearing his daughter could be left penniless, sends for his lawyer. Nelly also sends some servants to fetch Catherine from the Heights; but they return without her, having been told she is too ill to return. Suddenly Cathy shows up at the door after having become so distressed that Linton agreed to release her.