the book reads really well, but something are a little bit bothering. for instance, the character of Mary is absolutely unbelievable (too good to be true). the character of 'the old man' is so much Heinlein that i wonder how he could keep his writing straight.
the story is a little bit 'the body snatchers' meets 'twilight zone', but like i said it is pleasant to read. surely it shows its time.
Plus it had some terrific romance in the subplot. I highly recommend it.
This was a good story featuring alien invasion mixed with espionage. I liked the characters Sam, Mary and the Old Man.
This book has everything! It has grotesque aliens, Massive military troop movements, trips to other planets, love scenes, secret spy organizations. I love Robert heinlein and I love this book, great read.