New York: D. Appleton & Company, 1930. First edition. Hardcover. Near Fine / Very Good. Bound in original orange cloth, with lettering and design in red. (1) is present at the last page. In a complete dust jacket that shows some edge-wear at the head of the spine. The white portions of the panels and spine have darkened. The classic bibliomystery. Listed in Penzler. An unemployed bookman (imagine that!) travels the bookshops of London and Brussels looking for a manuscript containing a secret code. Previous owner name and date (1930) on the front free endpaper.