Title: Magic Tree House
Subtitle: Books 1 & 2: Dinosaurs Before Dark, The Knight at Dawn
Description: Jack and his younger sister Annie find a magic treehouse, which whisks them back to an ancient time zone where they see live dinosaurs. They also travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.
Subjects: Knights and knighthood, Dinosaurs, Tree houses, Middle Ages, Magic, Time travel, Fiction