Two young friends confront a puzzling inheritance after overhearing relatives discuss financial trouble; a bequest of an old house and a lucky ring leads them to investigate strange lights, noises, hidden letters, a secret stairway, and an eerie glen. Their search uncovers unexpected allies and threats, including a mysterious visitor, a vanished ring, and a small exotic pet, while family anxieties and legal complications threaten to deprive one girl of her legacy. The girls combine courage and cleverness to trace clues, reveal the house's secrets, and restore what was lost, blending everyday domestic detail with suspenseful discoveries.