The Cat Who Walks Through Walls get a very generous 3 stars due to the cute little kitten (“blurp!”), otherwise it’s a 2-star novel with a nonsensical plot. I just don’t know where to start, how to summarize it.
This was Heinlein’s 2nd to last novel and I cannot recommend it to anyone but a current RAH fan. There are no new ideas here and hardly any new characters, either. It doesn’t even benefit from being bizarre the way Greg Bear is, occasionally, where the strangeness itself is compelling.
The simplest description is, this is a sequel to The Moon is a Harsh Mistress, for it references events and characters from that novel before any others. I would have enjoyed it more if it had remained a sequel to that story. Unfortunately, he doesn’t stop there. As if intrigued by reviving that story, he goes on to revive characters from other novels as well and does a mashup.
There is some reason behind it, but I won’t go there due to spoilers. Just to say it involves multiverse theory and time travel, like most of his Lazarus Long stories.
I’m not a fan of this character. LL is not interesting, doesn’t actually DO anything but yap with people, sexually harass women, argue, and shoot at people. A nonsense character. I was intrigued by Time Enough for Love due to the shock value of most of it, but now that I see Heinlein dragging on that nonsense story to uncomfortable lengths, I’m disappointed that it comes to this and will not be reading the final novel in the series (and his career): To Sail Beyond the Sunset (which is a direct sequel and similar rubbish as this).
There are far better Heinlein novels. Frankly, I do not like anything about the Lazarus Long series. I would rather re-read Starship Troopers or Stranger in a Strange Land or any of a dozen other truly great stories from this author. Time better spent.