A solid enjoyable read. A little slow in a couple spots. I wish Heinlein would have spent more time on the character's relationships and motives. Even now I'm not sure exactly why the protagonist, Davis, did everything he did, but I sure enjoyed the ride.

It also had a really fun happy postmillenial, and almost ethical-judicial end to it. It's good to have some hope for the future. Never stop looking for that door to summer.