People are falling ill near Holborn and displaying a sickness with all the hallmarks of radiation poisoning. While Gilmore and Allison look into a graveyard, Sir Toby and Rachel venture underground to meet an old friend with a desperate scheme.
to be added
- Group Captain Ian Gilmore - Simon Williams
- Rachel Jensen - Pamela Salem
- Allison Williams - Karen Gledhill
- Sir Toby Kinsella - Hugh Ross
- Templeton - Philip Pope
- Dr Elizabeth Bradley - Celia Imrie
- Bridget - Mandi Symonds
- Mr Ackroyd - John Banks
- Ben/Medic/First Soldier - Tom Price
- Jenkins/Freeman/Second Soldier/Guard - Robert Lonsdale
- Mrs Pritchard died in 1878.
- Gilmore and Rachel had dinner together the previous night but she claims that it was "perfectly professional."
- Gilmore was once posted in Calcutta, India.
- Gilmore describes Allison as being "as icy as a holiday in Barbados".
- The citadel was sealed off six months ago.
- Sir Toby refers to a doctor as a credit to "Mr Bevan", referencing National Health Service founder Aneurin Bevan.
- This is the first Counter-Measures audio drama not to feature any science fiction elements.
- The four citadels - bunkers created in World War II in case of German invasion, which were expanded during the Cold War in case of nuclear attack - existed in real life. In the Behind the Scenes feature, James Goss said he created a fifth so he could set a story there without anybody "writing in to Big Finish saying 'ahhh, it can't be that one'."
- This story was recorded on 22, 23, 25 and 26 October 2012.
- Gilmore refers to the Waverly case and the fact that Emma Waverly is still a fugitive. (AUDIO: Manhunt)
- Allison refers to the fact that she was forced to kill her fiancé Julian St Stephen. (AUDIO: State of Emergency)
- Elizabeth Bradley refers to the Cuban Missile Crisis in October 1962 (PROSE: Heart of TARDIS; AUDIO: 1963) and the Starfire Incident in November 1963 (AUDIO: 1963: The Assassination Games).
- Gilmore refers to his nickname "Chunky." (TV: Remembrance of the Daleks)
- Bradley mentions that Sir Toby is a Catholic. (AUDIO: Artificial Intelligence)