I really enjoyed reading this. As a summary of the book, Stott argues that the concern for evangelism should primarily be for the glory of God, not the glory of the church or ourselves; the message must be the gospel of God, not something manmade; the manpower must be the church of God, and every member in it, not just a select few; and the power must be the Spirit of God, not our own personality, organization or eloquence (see 113-114 for his summary). Each of these main four ideas relates to the four chapters in the book.
As for some interesting points he made:
On page 26, he talks about how Paul uses the language of sacrifice when talking about converts in Rom. 15:16. As a result, Stott argues that "out ultimate aim is to 'offer' converts to God" (26). In other words, God is pleased with this. This is in the chapter of doing it to the glory of God.
On page 46 he argues that when it comes to conviction of sin, some may experience it more after conversion. He shows this is a biblical idea (Ez. 36:26-31). Then on the next page, he shows that it isn't the "eye of faith but the uplifted Christ who is gazed upon" which saves (47).
In the chapter on the church, he really shows that it should be the mission of everyone in the church to evangelize, and not just evangelists. To do this, he offers much practical adivce about how he does it at his church. He thinks in order for all in the church to continually be involved in evangelism, there needs to be three things: 1) training yearly; 2) door-to-door evangelism frequently (splitting up the area); and 3) special evangelistic events about once or twice a year. This chapter is full of practical advice and is very intriguing.
The final chapter is him basically showing that the Holy Spirit is the one who is needed for there to be any fruit. He must convict of sin and show Christ in order to bring about regeneration (rebirth) and then conversion (which he defines as turning in two ways: 1) turning from sin [repentance], and 2) turning to God [faith]). Here, he convicts by pointing out that if a church is ineffective in evangelism, it should ask "Why does the Holy Spirit appear to be bound? Is He grieved by our sin, or hampered by our unbelief? Do we need deeper repentance, or more prayer?" (113).
In sum, the book was well organized and helpful in thinking about evangelism. He weaved together theological insight and practical advice. It is too bad it isn't being published anymore today. Even though some of the advice might sound dated, Stott's insight is very helpful.
As a side note, the main reason I did not give it 5 stars is the lack of emphasis concerning hell. I just can't imagine talking about evangelism for 120 pages without really emphasizing this. A book like One Thing You Can't Do In Heaven, although much less theologically insightful and polished as Stott's book here, at least takes seriously the eternity of hell Christians believe in, which of course impacts their zeal for evangelism. Stott does not speak much of it, and it may be because he was always leaning toward Annihilationism. This is never even hinted at in the book, but knowing he believed this (at least later in his life), it tinted the whole book for me.