New York: The Mystery League, 1930. dj. Hardcover first edition - Eight guests have been invited to a party in a penthouse 19 stories above the street, only to discover that the other guests include a bitter enemy. Suddenly, a voice from the radio tells them that they will all be dead by morning, unless they can avoid the traps which have been set for them. A plot somewhat similar to Christie's 'Ten Little Indians', but published 10 years earlier. The first collaboration between these authors, and the basis of the 1934 film 'The Ninth Guest.' The sixth title (and one of the better stories) published by the rather short-lived Mystery League (1930-1933). Their books were unique in that they were sold through United Cigar Stores and Drug Stores, instead of bookstores, and despite the low price of 50c each, they were attractively bound in black silk with green lettering. They were also notable for the striking art nouveau dust jacket art (many, like this one, by Gene) 286 pp plus 1 p ad.