Mark Duncan has 4 audiobooks on Listento.it, narrated by 5 narrators. The most-rated is Professor & Ace: The Other Side.

To maintain their vessel, the Mistress and K9 must locate a sustainable power source and e-space-compatible technology - or lose the ability to time travel forever. Their answer lies within an ancient derelict Dyson sphere. But all is not as it seems, and the arrival of alien archaeologists from planet Herta, searching for evidence of the ancient, brings further danger. The Search is an original full-cast drama from BBV. Written by Mark Duncan. Produced & Directed by Bill Baggs. Post-production and music by Michael Neilson. Featuring: Lalla Ward (The Mistress), John Leeson (K-9), Graeme Du-Fresne (Kimmel / Vulich), Bryonie Pritchard (Jora), and Mike McCormack (Caloyer).
©1999 BBV (P)1999 BBV

Ace finds herself separated from the Professor, marooned, blind and cared for by a mysterious stranger. How did she get there? Who is Dorsai? What secret is he hiding? Notes: This is the fourth story in BBV's audio series featuring the Time Travellers. The Left Hand of Darkness is the first of two 'Ace Special' adventures which bring Sophie Aldred to the fore. Bill Baggs had been planning to feature Sophie's character alone and had commissioned BBV newcomer Mark Duncan to produce two adventures in which she would become separated from the Professor. When Sylvester McCoy (who makes guest appearances in these audios) went on holiday, there was an ideal opportunity to produce these adventures. Released: July 1998. Written by Mark Duncan. Directed by Bill Baggs. Post-Production by Nicholas Briggs. Music by Harvey Summers. Sylvester McCoy (The Professor), Sophie Aldred (Ace), Miles Richardson (Dorsai), John Ainsworth (Computer).A full-cast audio drama.
©1998 BBV (P)1998 BBV

"Who do you distrust the most? Me, or the thing outside?" Mount Chimborazo Radio Observatory in the Highlands of Ecuador is the site of some unearthly visitations, including the enigmatic Logan. But is she friend or foe? Or neither? And what is the true nature of "the thing outside" that threatens them all? Written by Mark Duncan. Directed by Paul Ebbs. Produced by Bill Baggs. Post-Production by Gareth Preston. Music by Mike Neilson. Susan Travers (Logan / Orb), Peter Yapp (Coleridge), Catherine Barker (Chase), Carlos Amsell (Mac), Brett James (Easton).
©1998 Mark Duncam (P)1998 BBV

Ace is apparently killed and her dead Nan appears to help her cross over to "the other side". Faced with her own internal demons, how long can she cling to life? And what is "the other side"? The final track of this download is a 10-minute edition discussion with Bill Baggs and Sophie Aldred, Editor Alistair Lock, and Assistant Producer John Ainsworth. With Sophie Aldred as Ace, Sylvester McCoy as The Professor, Barbara Shelley as Ace's Nan, Jane Burke as Nadia, Jack Galagher as the Paramedic, other voices by John Ainsworth and Alistair Lock. Sound Engineer: Alistair Lock. Post Production: Nick Briggs. Music: Harvey Summers. Asst. Prod. John Ainsworth. Produced and Directed by Bill Baggs.A full-cast audio drama.
©1998 BBV (P)1998 BBV