Last term in English we read the Cay.
The moral of the story that I understand from the themes of the book is "Trust" trust is extremely important in all types of relationships. - especially when being stuck on an island with a stranger, you'll need to develop a lot of trust in each other.
I give The Cay a 4 star rating and my comment about the book is that it had multiple good themes especially about racism, and talked to my dad about it.