Challenged, the third book in The Tenth Virtue series continues as Patrina enters a realm where everything seems to be too good to be true . . . at least until the two lights in the sky set. In a world where cave dwellers are normal and The Six can roam freely, Patrina and Briancka find that the creatures they escaped may not that far behind. Can Patrina and Briancka escape the shifters and dredglings before the Everlasting Tree goes to sleep?