The woodshed mystery: The Alden children are staying at the New England farmhouse where their grandfather grew up and find a surprising secret. The lighthouse mystery: When the Alden's take a summer trip to the New England coast, they have a fun place to stay: a lighthouse! Mountain top mystery: The Alden's climb a mountain and find a mystery.
7. The woodshed mystery -- 8. The lighthouse mystery -- 9. Mountain top mystery.