The Sonomancer (audio story)

 was the fourth and final story in the audio anthology Doom Coalition 2, produced by Big Finish Productions. It was written by Matt Fitton and featured Paul McGann as the Eighth Doctor, Nicola Walker as Liv Chenka, Hattie Morahan as Helen Sinclair and Alex Kingston as River Song.

Publisher's summary
On the other side of the galaxy a mining company is exploiting the already unstable planet of Syra for every precious mineral it contains. River Song is attempting to save the native people. She needs the Doctor's help, but she also knows he mustn't yet discover her true identity. The final confrontation sees the Doctor once again face his enemy the Eleven in an attempt to prevent the destruction of Syra and the genocide of its inhabitants.

Plot
to be added

Cast

 * The Doctor - Paul McGann
 * Liv Chenka - Nicola Walker
 * Helen Sinclair - Hattie Morahan
 * River Song - Alex Kingston
 * The Eleven - Mark Bonnar
 * Caleera - Emma Cunniffe
 * Ruslan - Derek Ezenagu
 * Yeva - Janet Fullerlove
 * Ivo - Derek Ezenagu
 * Mariam - Laura Harding
 * Mineworker / Galactic Heritage Officer / Shopkeeper - John Banks

Continuity

 * River asks Helen if the Doctor has come as "the magician, (TV: The Husbands of River Song) the spiv, or the geography teacher." (TV: Let's Kill Hitler onwards)
 * This incarnation would later encounter River Song in an encoded radio transmission, when she was under the pseudonym of Miss Spritz. (AUDIO: The Rulers of the Universe)
 * River is under the impression that all the Time Lords are dead. (TV: The End of the World et al.)
 * River calls herself Melody Malone. (TV: The Angels Take Manhattan, PROSE: The Angel's Kiss: A Melody Malone Mystery)
 * The Eleven sees that River has some aspects of a Time Lord. (TV: A Good Man Goes to War)
 * River references her doctorate from Luna University. (TV: Let's Kill Hitler, A Good Man Goes to War)
 * River says, "Just you wait 'til my husband gets home!" (TV: The Angels Take Manhattan)
 * River shows Helen three pictures of the Doctor in her diary to find out which incarnation she is travelling with: the magician, the spiv, or the geography teacher, but Helen says she is not travelling with any of them, then points out the Eighth Doctor's image and says she is travelling with him. River realises she cannot meet the Eighth Doctor or it will interfere with their timelines. (TV: The Time of Angels, The Husbands of River Song)
 * River comments that it would be very unlucky for the Doctor to see her "this many lifetimes before the wedding." (TV: The Wedding of River Song)
 * River uses Venusian martial arts on the Eleven. (TV: The Mind of Evil et al)
 * A trace of the Gift is in the Doctor's mind. (AUDIO: The Gift)
 * River contacts Galactic Heritage (PROSE: The Tomorrow Windows et al.), and tells Helen that they have warships.
 * Liv mentions the Lorelei. (AUDIO: Robophobia)
 * The Doctor awards gold stars to his companions. (TV: Demons of the Punjab)