Before email, before television, before telephones, how did people quickly get information from one place to another? In this story by Newbery Medal winner Park, set in 19th-century Korea, a firekeeper lights a bonfire atop a mountain every evening to signal to a faraway king that the shoreline is still secure. This lovely picture book introduces an interesting idea within a well-paced narrative--the firekeeper’s son must light the signal fire himself when his father is injured. All ends well, but a little gentle suspense ensures the journey is interesting.