The Shackleton Sabotage (The Boxcar Children Great Adventure #4)

In this all-new very special miniseries, the Aldens have been recruited by a secret society to return lost artifacts and treasures to their rightful locations-all around the world! The Aldens chart a course for Sydney, Australia, and 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. Using their knowledge about Australia, the Aldens find the coin's owner, but a saboteur...