Presents a look a medieval knights and castles, explaining boys became knights, how they conducted battles, and the weapons and armor they used, and examining the characteristics of early castles and their purpose in war.
When Ms. Frizzle and her student Arnold follow an underground passage beneath Craig's Castle Shop and find themselves in the middle of a siege of a 12th century English castle, they learn a great deal about both castles and the Middle Ages.
Eight-year-old Jack and his younger sister Annie use the magic tree house to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.
