The second in a series of pacy, mystery-adventure stories, set in the seamy, smoggy underworld of Victorian London.

A new sensation grips London - a poisoner who strikes without a trace, leaving victims mad with terror ... and then dead. Is there a cure for the black terror ? To find out, Wild Boy and Clarissa must catch the killer. Their hunt will lead them from the city's vilest slums to its grandest palaces, and to a darkness at the heart of its very highest society.