Robert Barnard said it is important to remember when this novel was written "If you can take all of the racialist remarks, which are very much of their time, this is a first-class romp, all the better for not being of the 'plot to take over the world' variety. It concerns the throne and crown jewels of Herzoslovakia, and combines such Hope-ful ["sic"] elements with bright young things and some effective caricatures." His final decision on the novel overall was that it was "By far the least awful of the early thrillers."