I've only read the first page, but I already know this will be my next "it's not Genji" read. How could I resist a book that opens like this?
There is a theory, which some people find harder and harder to refute, that the world is mad. Yet who among us can definitely prove or disprove this assertion? Madness, often enough, is merely a relative term, and the lunatic of yesterday may be the sage of to-day, while the sage of to-day may become the lunatic of to-morrow. There appears as yet no central point to sanity, unless it resides in the elusive seed of human happiness, and happiness is as difficult to define as madness itself.
Also, it's by Farjeon. I have high hopes.