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In the Pendragon series, the second book is called Cloral.  Now, like Denduron, Bobby has to try to stop another war from happening.  This time though, instead of being in a primal human time period, everything is futuristic and surrounded by water.  Bobby gets there the same way as he gets to Denduron but he says something different at the entrance of this flume.  He now has to adapt to a whole new survival tactic because of these new surroundings.  He also has to get use to a whole new group of people.  His adventure just keeps on getting better and better.