内容简介：
Welcome to the adventures of three young cousins, Joe, Dennis, and Susan Craig, as they explore caves, chase monsters, expose unethical treatment of animals, and visit a 150-year-old antebellum home. Through the three stories, the reader will come to love the characters--Joe for his brains, Dennis for his brute strength, and Susan for her no-nonsense bold style. The cousins originally grew up in towns close enough to spend time as children in the woods at a make-believe playground called Robin's Cliff. However, in reality, Robin's Cliff was nothing more than a huge gully, carved out by erosion, out in the middle of the Mississippi woods. Robin's Cliff soon became a magical spot as the kids regularly met there to play and let their imaginations run wild. The sleuthing skills attained at Robin's Cliff enable the youngsters to deal with several grown-up challenges with great success.