By Freeman Wills Crofts.

When a cask breaks open in a busy London shipping yard, the discovery of its contents leads to a puzzling case for Inspector Burnley of Scotland Yard. As the Inspector begins to trace the mysterious movements of the cask, his investigative procedures bring him to Paris and onto the path of a meticulously plotted murder, one step at a time.

New York: Thomas Seltzer, 1924. 342p.