Professor Bernice Summerfield and the Extinction Event

In 2001, The Extinction Event was released by Big Finish Productions.

Cover blurb
An exclusive auction house is offering the only known object to have survived the destruction of the planet Halstad. Professor Bernice Summerfield goes with Irving Braxiatel to secure this unique object for the Braxiatel Collection. But this is not a straightforward sale ­ there is a murderer on the loose, on the trail of whoever owns the Halstad Harp.