The Memory Box, by Jonathan Morris
This is the pilot episode for a new (well, new-ish now) Big Finish range featuring Chase Masterson as interstellar bounty-hunter Vienna Salvatore, who ruthlessly kills anyone who discovers her name and previously featured in the last story of the Drashani trilogy. It's rather good. Masterson takes her character and turns her into a classic BF performance; the story has the brilliant concept of memories that can be locked in a "memory box" and released if the correct passphrase is invoked, which leads to a brilliantly complex plot with overtones of Phil Dick paranoia. I have a huge backlog of BF audios at the moment but I shall get onto the other Vienna stories at some point, with enthusiasm.