Miss Nelson is missing! Miss Nelson was the nicest teacher in the school. She never yelled and she gave the easiest assignments. She was always smiling and cheery, even when her students cut up in class or would not open their arithmetic books nor pay attention during story hour. Until one day Miss Nelson did not come to school – a substitute teacher came instead. What an opportunity for everyone to be even more naughty. Not so! Miss Swamp immediately laid down the law – no talking, no goofing off in class – and she gave every student loads of homework. Where was Miss Nelson? Where was the wonderful unappreciated Miss Nelson? And so the students hunted for her high and low, with the dubious help of detective McSmogg. Harry Allard and James Marshall, with their incisive feel for the nuances of relationships, point out with imagination and humor the folly of being inconsiderate or unappreciative.