I like the Time Patrol element of this novel, making sure time tourists don't cause paradoxes and historical changes. I've not seen time travel approached from a tourist aspect before. I also liked the creative ending. I can't say I've seen such an ending before, so nicely done. However, I think Silverberg forgot he was writing one of his sci-fi novels rather than one of his sex novels, and made this a bit rated X in parts. The ideas behind the story get at least 4 stars, but the creepy incestuous parts take it down several notches. Ew.