Professor Bernice Summerfield and the Stone's Lament

In 2001, The Stones Lament was released by Big Finish Productions.

Cover blurb
Bratheen Traloor, reclusive billionaire, has lived alone for over twenty years on the planet Rhinvil. Now he has broken his isolation, inviting Bernice Summerfield to examine a mysterious artefact unearthed during building work at his sprawling mansion. Accompanying Benny is Adrian Wall, the Kiloran construction manager from the Braxiatel Collection. Adrian is responsible for overseeing the work, but his construction crew has vanished, and soon he and Benny discover that Traloor is not as alone as they might think...