This is a very strange book, for while it seems that quite a bit is happening, actually nothing much is happening. Written over 30 years after the second book of the Null-A trilogy, this novel brings in the old cast of characters only to have them do practically nothing. The novel poses this question: What do you get when you have two Gilbert Gosseyns alive and active at the same time? The novel concentrates on the adventures of Gilbert Gosseyn Three, who apparently accidentally awakes before Gilbert Gosseyn Two dies, breaking the sequentiality of the lives. van Vogt offers hardly an explanation at all for why this has happened. To make matters more complex, somehow Gosseyn Three's activation has triggered some kind of response whereby he unknowingly transports two great battle space vessels of contending empires from the galaxy two million light-years away from whence, according to the second novel of the trilogy, humanity originated. The "problem," then, for Gosseyn Three is how to come to terms with being activated too early, and how to send these space ships back, plus how to get laid, because apparently that was a burning question left from the previous two novels. The novel proceeds through a surprising amount of inactivity. Not much happens, except for Gosseyn using his "second brain" either to pop around from place to place, or to pop someone else around from place to place. It happens very much like a dream, and throughout I kept thinking that this was all a test, with scenarios being fed to a sleeping Gosseyn body. That is not the case, though it would have made more sense of what happens than the almost non-existent plot that van Vogt provides.