This is the book in which all puzzles are solved except one: what happens to the wathans after they finally break free from the reincarnation cycle? However, the expedition gets inside the tower and the identities of the mysterious stranger, X, is revealed, as well as that of the Operator.
I think the description of the boat battle is too long and detailed, and as usual there is too much repetition of explanations already present in the previous book about the peculiarities of life in the Riverworld. Apart from that, I’m still being dragged on by the compelling action and the affection I developed for some characters. Sadly, not all of them make it to the destination, but this makes the story more engaging.