For Alex Mack and her friends, going to a Renaissance Fair is a cool way to learn about the Middle Ages without even cracking a book. It's like stepping right into the days of knights and lords and ladies. And Alex, for once,could use a knight in shining armor. Separated from her friends, she gets whacked in the head by a stray leather ball, and it knocks her out cold. When she wakes up, Alex has completely lost her memory!