The Ruby is the fourth book in The Bracelet series by Jennie Hansen. It is the story of a girl named Charlie Mae. She is raised constantly taking care of a house full of boys and her elderly grandmother. Her mother is gone, and she is frequently beaten if she doesn't do things to her pa's liking. One night she secretly follows her brothers on a raid on the Mormons, and witnesses her father murder a defenseless man. That is when she finds the Ruby. Being afraid she'll be discovered she hides, but can't find her way home. She finds a friend in the Mormon community of Nauvoo, and his Grandmother teaches Charlie Mae to read and write. Things at home are about to get a lot worse, but Charlie and her brother somehow manage to escape and find themselves on a wagon train to California. Charlie's brother has dreams of mining for gold and becoming rich. I won't say any more on the plot, so you'll just have to get it and read it.
If you haven't read the rest of the series don't worry too much. The stories pretty much stand on their own. The only part you might be confused on is the tie-in with the ruby. The Bracelet is the first book in the series and that story tells where all the gems came from. The following books in the series follows each gem from the bracelet as they become separated and passed around to different people. I really like The Bracelet series. Each book has a lot of action, hardship, drama, spirituality and romance. I highly recommend them.