This is a hefty (800-plus pages) volume on the Doctrine of God, or what traditionally is called Theology Proper. Feinberg approaches the study of God from an evangelical perspective, upholding the inerrancy of Scripture. But he frames his discussion in the light of more recent theological systems, including process theology and open theism. He believes that some people are drawn to those theologies because they present a view of a God who is more responsive to human beings. He believes that an orthodox view of God needs to be sensitive to the ways in which Scripture portrays God as responding to his people's prayers and needs. Therefore, Feinberg produces a picture of God as the king who cares.
Major sections of the book are devoted to God's being, attributes, and interaction with the world. Feinberg provides a more nuanced look at God's attributes. The overall picture of God is what might be called a modified Calvinism, in which God is completely sovereign (decreeing and in control of all events in history) and people are compatibilistically free.
I found this book to be challenging but also very thorough. It's rather philosophical, which makes it a unique book of theology. I would highly recommend it, though the length and complexity of the book will likely turn off many readers.