This book is an examination of Romans through the lens of eschatology. It is probably the clearest explanation of Romans that I've read. If you start with the idea that the grand Biblical narrative is about evolving from the Mosaic Covenant to the New Covenant, the arguments in Romans make perfect sense in their own evolution. Did you ever wonder why chapters 9-11 seem out of place or an enigma to most interpreters? What if THEY were the climax of the soteriological argument instead of chapters 5-8?
Reformed types be warned: Perriman will invalidate your interpretation of key passages in Romans.