I have to say I am extremely impressed with the amount of work that went into the Castle series, but I am disappointed that it is apparently over. I would love to know what happened to the others that were trapped in the main vault at the end, and further, why the first lead character was killed off by the general. I understand that there was some serious tension, but at the same time I am confused by the details of the plot. What was the main purpose of exploring those castles, and what was the significance of the books they were after?