A group of lively siblings set off on a summer touring trip and must solve the mystery of missing photograph albums. Their search propels a sequence of episodic adventures—tinkering near a well, following trails, visiting farms and a lumber camp, riding rivers and motor boats, and coping with animal encounters and mistaken boxes. Each incident combines mischief, practical problem-solving, and cooperative play, and their persistence, quick thinking, and help from neighbors lead to the albums' eventual recovery.