In "The Lighthouse Mystery" by Gertrude Chandler Warner, the Alden siblings—Benny, Jessie, Violet, and Henry—find themselves at a lighthouse where they uncover intriguing secrets. The siblings explore the lighthouse and its surroundings, looking for clues about a mystery that seems to envelop the place. Their curiosity drives them to investigate, leading to unexpected discoveries about the lighthouse's history and its past inhabitants. As the story unfolds, the Aldens work together to piece together the puzzle, demonstrating teamwork and critical thinking. They encounter various challenges and obstacles but rely on their strengths and support for one another. With the guidance of their grandfather, the children navigate the mysteries, ultimately revealing truths that bring them closer together and illuminate the significance of their adventure.