Edition: First Edition; Very Good/No Dust Jacket; the pages have slight creasing around the edges. the black boards show surface damage. the pages are yellow and show foxing stains. The verso of the front board has signature. the copyright page has "CANADIAN EDITION FOR SALE ONLY IN CANADA" stamp. this book is the first american edition. The first locked room mystery by CARR DICKSON.
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February 1966 : UK Hardback
May 1989 : USA Mass Market Paperback