Here is Ginny's original instruction.
Simply give the title of a book which begins with the last letter of the title before it: *
Ex: The Good Earth:
Answer:How Green Was My Valley.
Next: A book title which starts with Y
* We'll ignore A, An, and The in titles for this game.
As I remember very, very common letter endings, like e and s at the end, were added later as an option.