As Solomon points out, the trouble with books is that there is no end to them.
So it is with New Testament theologies, introductions and commentaries. I've collected a few over the years, many are good reads. Dipping into the past I'm reading Leon Morris's at the moment.
Next buy is probably going to be Eugene Boring's NT intro and his 'People's' commentary.
I'm pleased that Boring has posted some videos of lectures on the topic. Would that others would follow suit.