First Edition/First Printing. Hardcover. Very good plus book in red cloth with gilt to the spine, title and author name stamped in black to front board. Foxing to endpapers, hinges loose but intact, bookplate to front pastedown, foxing to endpapers and light general wear to the edges. Some light spotting to page edges and fading to the spine. First issue missing the period after "G.K" on the spine and including the publisher's initials. An ingenious novel from the author of the Father Brown stories.