One warm night four children stood in front of a bakery. No one knew them. No one knew where they had come from. Henry, Jessie, Violet, and Benny are orphans. Can they find a home where they can stay together as a family?....

The Aldens spend the summer on their own private island. There they meet a new friend with an amazing secret....

Years ago, a man vanished from the yellow house on Surprise Island. Why? The Aldens have found a clue to the mystery....

The Aldens visit their mysterious Aunt Jane at her run-down ranch and make a surprising discovery....

Henry, Jessie, Violet, and Benny didn't think the old trunk in their house held anything interesting....

The Alden children are visiting Aunt Jane when a nearby house burns down....

The Aldens are excited to visit a deserted South Seas island. But soon they discover clues that they are not alone. Is someone on the island watching them....

As the children tour the famed Sydney Opera House, their next puzzle - and its key - falls right into their laps. They need to find the rightful owner of a rare Australian coin....

The Alden children are staying at the New England farmhouse where their grandfather grew up. There are many stories and legends about the old farm....

The Alden children are helping their neighbors build a tree house. From the tree house, the children discover they can see into the attic of the house next door....