Following on from The Sign of the Glove, 'three principal characters are living in peace and prosperity after their adventures, and the story Is told by one of them, Colonel Peter Gantian, who takes up the main burden of the Incidents that follow on the reappearance of Leo Jask, a criminal and revolutionary, with whom they are all well acquainted and of whose death or existence there had been doubt. The troubles of Colonel Gantlan begin when the young son of one of the three good companions is kidnapped and spirited away to unknown places in London, where the hunt is vigoriously [sic] carried on by the colonel, aided by his former batman of the war. This is not a detective story, though it Is written In the style of the popular fiction of that class. It is full of strange disguisings and mysterious clues, and moves with life on every page, so that the Interest will be carried from day to day by our readers.'
Source:
'New Serial', Sydney Morning Herald, 21 April 1932, p.4.