Where did Atticus go the night before the trial?

How is Jem acting lately?

In chapter 15, Atticus leaves the house after supper. He takes an extension cord and a light with him. Because he takes his car, Jem becomes worried about him. Jem decides to follow Atticus because he knows that since the group of men came to the house the night before, he feels Atticus may be in danger. Jem feels that as long as he is able to see Atticus, he won't worry as much about him. He finds Atticus sitting guard in front of the jailhouse. Because Tom Robinson has been brought back to Maycomb, Atticus knows that a lynch mob may be coming, and he wants to stop them from taking the law into their own hands.