I know a child who is interested in how Latin influenced English, how groups of words are similar because of Latin roots etc., and would like to learn more. He doesn't want to learn Latin itself, but just more about its influence on English, so I'm looking for something child-friendly (for and 11/12 year old) that would help learn vocabulary via Latin, but is also just interesting about how the words came to be like that, how they've changed over time, etc
I've got a couple of History of English type books for him, but they're not specifically about Latin and root words, so I'd like something a bit more focused on that, but not a really dry textbook - more for kids, for fun and interest.
Any ideas?