Devil in the Smoke (novel)

 was an e-book exclusive prequel to ''The Snowmen.

Publisher's summary
''Madame Vastra, the fabled Lizard Woman of Paternoster Row, knew death in many shapes and forms. But perhaps one of the most bizarre of these was death by snow...''

On a cold day in December, two young boys, tired of sweeping snow from the workhouse yard, decide to build a snowman – and are confronted with a strange and grisly mystery. In horrified fascination, they watch as their snowman begins to bleed...

The search for answers to this impossible event will plunge Harry into the most hazardous – and exhilarating – adventure of his life. He will encounter a hideous troll. He will dine with a mysterious parlour maid. And he will help the Great Detective, Madame Vastra, save the world from the terrifying Devil in the Smoke.

Characters

 * Madame Vastra
 * Harry
 * Strax
 * Jenny
 * Jim
 * Felicity Gregson
 * Able Hecklington

Continuity

 * Vastra and Jenny display their sword fighting capabilities. (TV: A Good Man Goes to War)
 * Strax mentions the Moonites. (TV: The Great Detective)
 * Strax repeats the "Sontar-Ha!" battle cry on multiple occasions. (TV: The Sontaran Stratagem / The Poison Sky)