I do believe mI still have your last one.
I know about that, and I appreciate it. But I think that was the first one.
Of the four I've completed, my favorite is indeed the last one, called "Reaction!" (304 pp). Although to properly appreciate it, you might want to preface it with "Action!" (369 pp)
It makes for a lot of reading, but I prefer to think that it makes for a lot of thinking "hmmm" as well.