I thought the fourth installation in the Riverworld series would be exciting. At last, they are going to reach the tower and confront the unknown entities who have done this to humans! But first, unfortunately, Farmer drags on endlessly about the final gathering of the main characters and the battle between the two paddle wheelers, which drags ON and ON, chapter after chapter, describing each turn and blow ad nauseum. I couldn't even finish it. If my husband would let me, I would donate these books to Goodwill.