Stephanie Matthews is a doctor who specialised in medical biochemistry and founded The Darwin Centre and The Young Darwinian. A consummate Francophile, when Stephanie came across the Drummond murders, she found a man who was not only a father figure in her specialties of biochemistry and nutrition but also a hero of the Second World War.

Daniel Smith has written over thirty non-fiction titles, which have been translated into more than twenty languages. His most recent narrative non-fiction includes The Peer and the Gangster (long-listed for the Crime Writers' Association Gold Dagger) and Scandal at Dolphin Square.