In book two of the Time out of Time series, the excitement and mystery continue as Timothy; his sister, Sarah; and their friend, Jessica, journey to Edinburgh, Scotland, where they seek the Four Treasures, especially the Telling Stone. They must keep the treasures from falling into the hands of Balor, who will use them to deprive the world of good. The children pass through Time out of Time as they undertake their quest, encountering mythic and folkloric characters, including the Tuatha Dé Danann, Gwydon, and Cerridwyn.

A code hidden in an ancient map is the key to finding the Telling Stone. The book includes a four-color map and concludes with a glossary of the many historical, literary, and folkloric references mentioned in both this and the first Time out of Time volume.