A group of young friends travel to a forest lodge to visit an eccentric relative and enjoy a summer retreat with college-age companions. Their holiday turns into a mystery and adventure when they encounter a strange hut in a swamp, counterfeit money, a wrecked bridge, fires, and other hazards that point to deliberate mischief. Working together with allies, they follow clues, endure dangerous encounters and brief imprisonment, stage daring escapes, and finally achieve a capture aided by wireless radio communication. The tale emphasizes teamwork, quick thinking, practical skills, and the inventive use of emerging technology to resolve danger and restore safety.