This a great little nonfiction book, which will appeal to younger readers.  The visual formatting is appealing, and it has pictures of real police cars, including the engine, the computer system inside, and parts of the car.  It also includes some early photographs of some of the first police cars and paddy wagons from early 20th century.  In the back is the glossary of vocabulary words and additional resources.  Unexpected was the hands-on art project to make your own siren at home using a cup and some wax paper.  Nice touch of integrating an art activity with the learning.  Recommended,