R. C. Sproul's trilogy on the Westminster Confession of Faith is now complete.
Volume 1 is on The Triune God; volume 2 is on Salvation and the Christian Life; volume 3 is on the State, the Family, the Church, and Last Things.
Some sample chapters are available; you can read Sproul on the holy Scripture (ch. 1 of WCF), free will (ch. 9 of WCF), the civil magistrate (ch. 23 of WCF).