The second part of the book deals with the investigation into the aftermath of the Grey Man's attack. Then, in the final third of the story, Mosley deals with the flight of the survivors of the Grey Man's assault, the completion of the evolution of the Blues and halflings, their literal and figurative passions, and their final confrontation with the being who would be Death. Heavenly blessed and worldly wise Blue Light is not about alien abduction, but rather alien induction . Rather than taking those it strikes away from the world, it adds something to them, infusing them with with understanding, purpose and power. At the moment of their epiphany, the Blues become both fully human and completely transcendent, the participants in an extraterrestrial Pentecost.
Christian themes abound throughout the book.
Mosley himself is not only a skilled writer, but an uncommonly intelligent and thoughtful one. Setting the story in San Francisco in the late 1960s is another masterstroke on Mosley's part. Amid the sound and fury of the counterculture, the Blue Light super-culture seems like nothing more than another fringe group. Later, the sect's disappearance goes all but unnoticed amid the debris of an entire generation playing at enlightenment, leaving Mosley free to explore the next phase of human evolution outside the context of everyday history. Despite the author's careful structure and craft, this exploration is not without its flaws, particularly in the last third of the book.