A Spanish-language edition of the very popular Harry Allard-James Marshall collaboration about Room 207's missing schoolteacher. Miss Nelson is the nicest teacher in the whole school. She never yells, and she gives the easiest assignments. Then one day Miss Nelson is not at school. There is a substitute, Miss Viola Swamp, who immediately lays down the law - no talking, no goofing off in class - and gives lots of homework. Where is the wonderful, unappreciated Miss Nelson? Is she ever coming back? Allard and Marshall, with their incisive feel for the nuances of relationships, point out with imagination and much humor the folly of being inconsiderate and unappreciative.