My boys and I read this adventure over the summer. We loved all of the characters, especially the resilient, hardworking Penny. For a book that was written over 60 years ago to still keep the attention of modern children, it must be good. The ages of the children in the story are a perfect match for the middle grade children that this book appeals to. The only hindrance that we had, was all of the unfamiliar nautical language. However, we used that as an opportunity to add some new words to our vocabulary. Great book! Highly recommended.