The Cat Who Walks Through Walls is like Alien Vs. Predator. Heinlein devotees will like it, but it is short on literary merit. We delight to revisit the world of The Moon is a Harsh Mistress, with a bit of who-dunnit thrown in, but after a little while we end up meeting characters from other works in a heavily meta-literary setting, that is just a bit much. So if you like Heinlein this book is fun, but it falls short of the majesty of Moon, and the innocent wonder of a work like Have Spacesuit Will Travel. Good, but not great.

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