This is the third of Duguid's books in The Gospel According to the Old Testament series that I have read, and it is just as good as his first two (one on Abraham, one on Isaac and Jacob). He covers Genesis 37-50, concentrating not only on Joseph but also on his brothers, and on Jacob as well. As he points out, the story is not just about Joseph, not even just about Joseph and his brothers. It is part of "the story about God's grand plan for Israel and what he is up to in the lives of his people as a whole."
Duguid does a superb job of pointing out the sin in Joseph as well as the sin in his brothers and father. He shows how God not only chastens us but also how he can and does use even our sin to accomplish his purposes in our lives and the lives of others. He constantly points out how God is continuing to bring to fruition his promises to Abraham to make him a great nation and to bless all nations through him. As with Abraham and Isaac, Jacob and Joseph and his brothers do not see these promises come to full fruition, but in their lives they see the beginnings of God's plan in action. We see, for example, that through Joseph blessing is not only brought to his family but also to the Egyptians and to the world at large in Joseph's wise provision of food during a famine.
Duguid doesn't flinch in dealing with the unpleasant chapter about Judah and Tamar, and properly shows how God used even the great sinfulness of that entire situation to further his purposes, and to include Tamar in the line from which the Messiah would come. He also does an excellent job of reminding us that the Bible doesn't present Joseph as some hero whom we should model, that the purpose is not to encourage us to ask in times of temptation, what would Joseph do? "Its purpose is to encourage you to ponder what Jesus has done in your place."
As with his previous books, I greatly appreciate Duguid's humility and open admission of his own struggles with sin, and how he points us in every chapter to Jesus and his work on our behalf. This is truly an excellent book, once which I highly recommend.