This is a wonderful book and one that I often finds comes to mind even thought I read it years ago. The book takes its name from the restoration of a king to the throne of England. Robert Merivel is the protagonist in the story, a man awakening to himself and the effect he has on the world.
The era is caught well with some brilliant evocations of London and also the life of the early Quakers. It builds to a climax that is perhaps unexpected but (for me at least) deeply satisfying.