The Gnostics: Myth, Ritual, and Diversity in Early Christianity

In his latest book, Bart Ehrman recommends this for a recent look at the scholarship, and the small volume does provide that in various helpful ways. This includes a brief summary of gnostic thought and a reminder that the lines between it and others strands is not as stark as might be thought. This overlaps with some of Ehrman's discussion of views on God in the era. There is some stuff hard going for non-experts. Mixed bag.