61. The King Jesus Gospel by Scot McKnight
Here is his point:
The gospel is the declaration that Jesus is Messiah and Lord and that gospel declares that the Story of Jesus completes the Story of Israel in a way that saves. This gospel counters the shallow and superficial gospeling today that reduces the gospel to four simple points and eliminates the confession that Jesus is Messiah and Lord.
Here is the video that introduces the book:
He advocates that "Creation to Christ to End Time Consummation" is the whole gospel. He looks at what Jesus, Peter, and Paul meant when they said "gospel."
We have our groups go through the whole book of Acts and try to define what the gospel was that the apostles were preaching. His book does this for you, but I think it is better to look at the Scriptures directly for yourself! :)