Mrs. Alden's third grade class is thrilled when she brings in a suitcase she found. They get to be detectives as they examine the contents and try to discover the owner, who turns out to be Alice Van Brocken, an elderly woman on the track of jewelthieves she had seen stealing a diamond necklace. As she travels about the country on their trail, she writes to the students telling them of heradventures which are often dangerous. They write back and give...