This book is about Grace, a young girl in the early 1900s when the automobile was a fairly new invention. Grace's curiosity gets the best of her and she sneaks into a doctor's car just to see what it would be like to sit in a car. She begins to daydream that she is taking a ride when suddenly the car door opens and the doctor drives off on his way to visit his patients, unaware that he has a passenger along. What happens after that makes for a very interesting and exciting adventure, not only for Grace and the doctor but also for her family when they discover she is missing.