In "Surprise Island" by Gertrude Chandler Warner, the story follows Jessie and her siblings as they embark on an adventurous summer on an island. They explore the unique environment, discovering the beauty of nature and the excitement that comes with exploration. The narrative highlights Jessie's awareness and insight, indicating that she comprehends the significance of their experiences and the world around them.

Jessie's understanding plays a pivotal role in the story, as it underlines the themes of growth, adventure, and the bond between siblings. The journey they undertake is not just about reaching a destination but about embracing the lessons learned along the way, as Jessie's reflections guide their adventures and strengthen their relationships.