"Swamp Island" by Mildred A. Wirt is a young adult mystery novel likely written in the mid-20th century. The book centers around Penny Parker, a resourceful and adventurous girl, along with her friend Louise Sidell, as they embark on a seemingly innocent flower-gathering trip in the swamp. However, their excursion quickly turns suspenseful as they encounter a mysterious bearded man and overhear a conversation that suggests something more sinister may be afoot. The opening of "Swamp Island" introduces Penny and Louise as they navigate the swamp in search of flowers for a banquet. Their day takes a dark turn when they hear unfamiliar voices and encounter the bearded man, leading to the unfortunate loss of Penny's dog, Bones. As they return, the girls cannot shake the sense that their trip has uncovered a lurking danger, especially with recent news of an escaped convict named Danny Deevers. The chapter escalates with tensions that set the stage for a deeper mystery involving local criminals and the potential search for Penny's lost pet, drawing readers into a suspenseful narrative filled with intrigue and peril. (This is an automatically generated summary.)