First Edition. Gene dustjacket art. One of the most uncommon Mystery League titles. A social outcast from New York's smart set returns from Africa with a huge fortune "derived from sources about which he refuses to comment" becomes the sensation of the city. "It remained for Elliot Brooks, young and in love with Van Haagen's secretary, to stumble while on a Harlem slumming party upon the sinister trail which, through the weird brotherhood of darkness, led to the cloistered and well guarded bungalow on the roof. Little did he appreciate that his being mistaken for number seven of the brotherhood would lead him to the solution of the riddle of the horrible source of Van Haagen's wealth". Near Fine in Very Good dustjacket, red coloring at spine faded.