This is book 5 in the series. The wagon train is the same train in all of the books but there is a different main character. The story is told from that characters experience in the wagon train. The character in this book, Rebecca, shows signs of depression all through her experience. She has good reason to be depressed. Her depression is seen in her pulling into herself, manic episodes so she does not have to think about the life experience that has depressed her, not wanting to be with the people she loves most and who love her the most, shirking her responsibilities. All are behaviors of which she would not usually be guilty. Her attitude moves between not wanting to be there at all to being driven to go forward. Rebecca is unpredictable. Sometimes we view depression as withdrawal but it has many more sides. Friends and family try to help her, they probably think that they have barely scratched the problem but Rebecca does go back and think about their words often rejecting them in the beginning but they continue to roam around in her head giving her the opportunity to see some truth in them.