"The Sea of Trolls" is a captivating fantasy novel by Nancy Farmer that combines elements of Norse mythology and adventure. The story follows a young boy named Jack and his sister, a spirited character named Lucy, living in a Viking world. Their lives change dramatically when they are captured by a fearsome band of trolls while Jack is on a journey to find his missing sister. The siblings must navigate a land filled with danger and magic, relying on their wits and bravery to survive. As Jack faces the trolls, he learns valuable lessons about courage, loyalty, and the strength of family bonds. The tale weaves through various mythological elements, introducing significant figures from Norse legends, which adds depth to the characters and the journey they undertake. The author vividly depicts their challenges and triumphs, providing an engaging narrative that keeps readers enchanted throughout. The novel not only showcases an adventurous quest but also explores deeper themes, such as identity and belonging, as Jack and Lucy learn about their own strengths in the face of adversity. With rich descriptions and a compelling plot, "The Sea of Trolls" is a remarkable blend of history and fantasy that appeals to a wide range of readers, making it a memorable addition to children’s literature.