Here's the review I read:
Terence Gray, a sage, Irish aristocrat, and scholar who wandered the Himalayas before his death in the 1980s, published several important books under the pseudonym, Wei Wu Wei. His books, like Ramesh [Balsekar]’s teaching, emphasize the importance of the deep understanding of the absence of volition and of the “I”. Ramesh has stated that he has read one of Wei Wu Wei’s books, Open Secret (1970), at least a hundred times (Consciousness Writes (1998) private distribution). I have found that Open Secret and another one, Posthumous Pieces (1968), are both extremely powerful and succinct metaphysical pointers to Reality.
I just picked up Open Secret today, and it was mind-blowing

After reading a few chapters I had the realization that logically it didn't even make sense why anything should exist at all, and I experienced something close to the Voidness of Nothingness; and then I realized that even though there is Nothingness, I am still experiencing this reality, this body-mind, this universe, and therefore Nothingness is also equivalent to Allness. I don't know what happened, but for hours I couldn't stop giggling at how comical the human drama in this world is
It doesn't even make any sense when I read this now, lol

but I give my thumbs-up to Wei Wu Wei. Does anybody else have any comments or experiences with his stuff?
A good intro and links to some extracts:
WEI WU WEI ARCHIVES - INTRODUCTION