"Betty Lee, Senior" by Harriet Pyne Grove follows the adventures of Betty Lee and her friends during a summer vacation before their senior year of high school. Betty, along with her close friends Kathryn Allen and Carolyn Gwynne, embarks on a trip to the coast of Maine, where they stay at a new cottage owned by Carolyn's family. The narrative captures the excitement and novelty of experiencing the ocean and the various activities that come with it, such as beach parties, picnics, and boating excursions. The girls are joined by familiar faces, including the Dorrance brothers, Chet and Ted, and new acquaintances like the Penrose siblings, Arthur and Gwen. The story is filled with light-hearted moments, such as fudge parties and comic sketches, but also touches on more serious themes when a storm hits the coast, leading to a dramatic rescue of a stranger stranded on an island. Throughout the novel, Betty's character is portrayed as adventurous and compassionate, always ready to embrace new experiences and help those in need. The book highlights the importance of friendship, the thrill of new experiences, and the beauty of the natural world.