The last time Commander Gideon of the Yard had seen fog like it, he was just a lad. Clean air policies had more or less banished the thick, impenetrable, chokingly sulphurous fumes of old…until now. Sat in his car, enveloped, Gideon spied a gleam of light from across the common and alarm rose in him. What had he seen? What sort of misdeeds did the fog conceal? Elsewhere in London that night, others are moving in the murky air – a league of militants, determined to clear the city’s parks of promiscuity and shameless abandon. And Gideon must find his way through the suffocating darkness to reach the truth.

Master crime fiction writer John Creasey's near 600 titles have sold more than 80 million copies in over 25 languages across 100 countries under both his own name and more than 20 other pseudonyms. His style varied with each identity and led to him being regarded as a literary phenomenon. Amongst the many series written were ,Gideon of Scotland Yard, The Toff, The Baron, Dr. Palfrey and Inspector West, as JJ Marric, Michael Halliday, Patrick Dawlish and others.