How Are We to Understand Faith Without Works is Dead?

The apostle Paul said, “Believe in the Lord Jesus, and you will be saved.” (Ac 16:31) Does James contradict this? “Even so faith, if it has no works, is dead in itself,” wrote the disciple James. …. “For as the body apart from the spirit is dead, so also faith apart from works is dead.” (James 2:26) Do Paul and James disagree on Justification by Faith Alone?