'An excellent and thrilling story. It is the tale of the "Fogmen" who work in the fogs of London and by skilful planning manage to evade Scotland Yard for a long time. The love story of Frank Slade and Lady Anne Sanfild runs through it, and Quaile, the Yard Inspector, steadily works his way to a solution of the mystery.' (Dust jacket blurb attributed to Current Literature)
