"The Greengage Summer" is a novel by Rumer Godden that tells the story of a family vacation in France during the summer of 1945. The narrative follows the lives of the three sisters—Jill, Catherine, and Margo—as they explore their surroundings and encounter new experiences. The novel captures the innocence of childhood and the complexities of growing up. As the sisters interact with the local community, they meet a mysterious Frenchman and a young boy, which leads to a series of adventures and emotional discoveries. The story delves into themes of love, loss, and the transition from childhood to adulthood, set against the backdrop of a post-war landscape.