The book is about mystery and adventure. I think this book has a very good layout when the cat, with green eyes, came out to attack the main character because he knows the old man and the cat's secret. The book is full of mysterious things. Like, the old man is taking out other cats' viscera and do a weird device, also the green eye cat act like a human, it have feelings. I really recomand this book to people who love to read mystery and adventure type books.