An excellent book. As I re-read Genesis, I had great difficulty understanding some passages and cultural customs, especially what they mean in light of Christ, modern science, and modern scholarship. On each of these counts, Longman answers knowledgeably, gracefully, and humbly.
The book is a shorter one but serves as a great introduction to the scholarly theories of where Genesis came from (Longman presents a reasonable compromise--pre-Mosaic sources, God's revelation to Moses, and some post-Mosaic sources) as opposed to the secular strains of the documentary hypothesis. Longman shows that Genesis is indeed a great literary work in language, structure, themes, but also a source of divine truth and theology.
The archaeological aspect of Genesis is also addressed and socio-cultural norms presented in Genesis is analyzed. The use of extra-biblical documents serves well to illustrate the cultural context of the time. However, Longman's survey is not in depth.
The best aspect of this book is how Christ is shown in Genesis and how Genesis is truly the foundation of our faith. The God of Abraham, Isaac, and Jacob, often derided by the new atheists as a blood-thirsty and vicious God is nothing like that. In fact, the motifs of sin, righteous judgment, and divine grace and mercy is repeated throughout the text. The attacks on Genesis as a mish-mashed and inconsistent text is thoroughly wrong. God is the same yesterday, today, and tomorrow!
Overall, although young-earth creationists may not completely agree with Longman's interpretation of Genesis, his interpretation is a faith-affirming, informative, and excellent read!