The Old Testament is often considered as Law and the New as Grace. This book, The God of Isaac explores how God dealt with the Patriarchs in grace also. We see this grace extending beyond the Fathers themselves to gentiles surrounding them. The book looks at Genesis Chapter 21 to 27, the chapters covering the life of Isaac, in detail. It also contains a number of word studies of key hebrew words. many of its conclusions are different from those of other commentators but I believe the case is argued sufficiently to establish this.