Liz McIntyre is assigned to substitute in the "Preparation for Marriage" class taught by middle-aged Miss Tandy. Liz discovers that the class is based entirely on Miss Tandy reading aloud from a book composed of notes she has compiled over the years, much of which is no longer relevant to her students' lives. Liz decides to put the book aside to lead a discussion among the students -- something the students like so much that they ask for Liz to replace Miss Tandy as the teacher for the class.
—aldanoli