I think this is a great book for kids. It teaches the importance of modesty, truth, and perseverance.
It is about a girl, Olivia, who is saving up to sponsor a child in Guatemala. Her family, along with her best friend Hayley, ends up spending a whole month at the beach--a once-in-a-lifetime chance for Olivia, whose family isn't very well-off. At the beach, she and Hayley meet a group of rich kids, and to make them like her, Olivia lies about her family's financial position. She ends up lying more and more, and buying immodest clothes to impress her newly-made friends.
(SPOILER ALERT)
During this time, Olivia and Hayley go to a Fourth of July party, where Hayley dances with one of the wealthy boys, Bryan. Then, Bryan secretly texts Hayley to meet him and a few friends at night at the beach. Olivia secretly reads this text, and on that night, follows Hayley to the beach. She eventually is discovered and allowed to go with the group.
Against Olivia's and Hayley's judgement, Bryan and the rest dig up a hole of turtle eggs, and start throwing them around, killing the young turtles. Horrified, Olivia and Hayley secretly cup the last undamaged turtle egg in their hands and run off to bury it farther along the beach.
The next morning, Olivia and her father are out on a walk. They find the spot where Bryan and the others had dug up the eggs and Olivia's father calls the police. Meanwhile, Olivia has also found the spot where she and Hayley had buried the last egg. She finds sliding tracks from there to the ocean, and realizes the turtle had lived.
Eventually, Olivia gets things straightened out and confesses her lies to her friends and to God.
Hayley surprises Olivia by sponsoring a child for her, since she has spent all her money at the beach.
I especially liked how the author was constantly quoting St. Therese. This was a great sequel to Olivia and the Little Way.