In the story’s second section, Jack and Annie’s exploration of the castle advances the theme of Learning Through the Excitement of Discovery. Books continue to support the theme as the volume about castles teaches Jack and Annie about their new surroundings as they interact with the environment in real time. Osborne uses factual historical details about food, fashion, and entertainment in the Middle Ages to depict a lavish celebration in Chapter 4, and Jack’s astonished reaction to witnessing a scene from history unfolding before his eyes demonstrates his growing excitement: “‘The feast in the Great Hall!’ whispered Jack. He held his breath as he stared in awe” (25). Another important event supporting the theme of discovery occurs when Jack tries on a helmet in Chapter 5. Reading about the weight of armor and helmets sparks his curiosity, making him want to investigate for himself. This moment represents a shift from Jack’s prior cautious reliance on books over experience for learning, as evidenced earlier when he preferred to look at a picture of the castle rather than the real thing. Although the noise Jack makes while wearing the helmet leads to the children’s capture, this event can still be seen in a positive light because taking risks and making mistakes are essential parts of the learning experience and offer valuable growth opportunities. With this idea in mind, the chase scenes with the castle’s guards contribute to the theme in multiple ways. They escalate the story’s suspense and excitement, and Osborne uses Jack and Annie’s hiding places to showcase different features of a medieval castle, including the storeroom and the armory.

The perils that Jack faces in the castle also contribute to his growth by moving him ahead on The Journey Toward Overcoming Fear. One of the story’s most frightening moments for Jack occurs in Chapter 6 when the guards march him and Annie to the dungeon, which is “the creepiest place Jack had ever seen” (35). Earlier, Jack established that he is afraid of the dark, so the dungeon is especially terrifying for him. However, with his sister’s help, he faces his fears and escapes. His development and growth as a character also develop this theme in Chapter 7 when he shows courage by being the first to go through the trapdoor into the “damp, creepy tunnel” and the first to go over the precipice (51). Annie usually goes first because that is her nature, but in this example, Jack goes first partly due to his newfound courage and partly from a sense of protectiveness for his sister. Jack and Annie’s daring escape from the castle contains perils that are suitably mild for young readers while also challenging Jack to take steps along his journey toward overcoming fear.

Jack and Annie’s escape is aided by their teamwork as they cooperate to outwit and evade the guards, demonstrating The Value of Teamwork and Problem-Solving. For example, Annie’s imagination and quick thinking allow the children to escape the dungeon in Chapter 6: “‘My magic wand!’ Annie said, waving the flashlight. ‘Get down. Or I’ll wipe you out!” […] Annie fiercely pointed her light at Squinty, then at Mustache, and then at Red. Each howled and covered his face” (36). This scene fulfills the foreshadowing in Chapter 1 when Annie pretends that her flashlight is a magic wand. In Chapter 7, Jack’s reading skills and his utilization of the available resources allow the children to solve the problem of finding an escape route out of the castle: “‘Look,’ said Jack. He pointed at the map. ‘There’s a trapdoor’” (50). Additionally, the siblings work together to move the heavy stone covering the trapdoor and to pull the trapdoor open, proving that they’re cooperating much more effectively than they were at the start of this adventure.