Acts 24 continues the story of Paul on trial. The Jews used flattery to accuse him, but Paul used facts. He was on trial for his faith in the resurrection.
What was the purpose of the Law, and how were Old Testament believers saved? The Law points to our need for grace before a holy God, and the foundation of salvation has always been Christ.
Wherever Paul went on his missionary journeys, God raised up other Christians to assist him. In Acts 18, we see this ecclesiastical synergy at work again.