The first half of this book is just as good as anything Heinlein ever wrote. However, the second half leaves something to be desired. I mean, really leaves[return]something to be desired. While it isn't as confusing as the ending of to sail beyond the sunset, it makes up for this with the fact that it really sucks.[return]When you start coming across many characters you recognize from other books, it's time to stop reading. Make up your own ending if you must. You'll be[return]happier.