When scout and jem go to their father's office around ten o'clock at night, he isn't there. where is he?

When attempting to go visit their father in the late night around nine or ten in the afternoon, Scout and Jem found that their father was not in his office, but rather was out with the individual that, at the time, he was attempting to keep from being executed as a result of unfair trials.

Dcalifornia they have the most people with 200+ people per square mile