The theme of this book is if you set your heart on something, you should just go for it and don't let anyone stop you. Nancy finds a strange house with a really tall fence. She climbs up a tree and sees that there is a symbol on the chimney. She thinks it is a distress call. Nancy finds a freind who knows the symbol means "help." Nancy later rescues the father and daughter who were reported missing. I think kids who like mystery very much should read this book. Ashley G., Grade 6