Ace Books published 135 mystery Ace doubles between 1952 and 1965 in dos-a-dos format. Genres and Collectability Ace published science fiction, mysteries, and westerns, as well as books not in any of these genres. Collectors of these genres have found the Ace doubles an attractive set of books to collect, because of the unusual appearance of the dos-a-dos format. The list given here gives a date of publication; in all cases this refers to the date of publication by Ace, and not the date of original publication of the novels. For more information about the history of these titles, see Ace Books, which includes a discussion of the serial numbering conventions used and an explanation of the letter-code system. D Series D-1 MY Samuel W. Taylor The Grinning Gismo / Keith Vining Too Hot For Hell (1952) D-3 MY Mel Colton The Big Fix / Kate Clugston Twist the Knife Slowly (A Murderer in the House) (1952) D-5 MY Eaton R. Goldthwaite The Scarlet Spade / Harry Whittington Drawn To Evil (1952) D-7 MY Stephen Ransome I, the Executioner (False Bounty) / Harry Whittington So Dead My Love! (1953) D-9 MY Michael Morgan Decoy / Sherwood King If I Die Before I Wake (1953) D-11 MY Day Keene Mrs. Homicide / William L. Stuart Dead Ahead D-15 MY William S. Burroughs (as William Lee) Junkie / Maurice Helbrant Narcotic Agent (1953) D-16 MY Edmond de Goncourt and J. De Goncourt Germinie / Paul Bourget Crime D'Amour (1953) D-17 MY William Campbell Gault (as Roney Scott) Shakedown / Howard Fast (as Walter Ericson) The Darkness Within D-19 MY Hal Braham (as Mel Colton) Never Kill A Cop / Leslie Edgley Fear No More (1953) D-21 MY John N. Makris Nightshade / Lester Dent High Stakes (1953) D-23 MY Louis Trimble (as Stuart Brock) Bring Back Her Body / Richard Sale Passing Strange (1953) D-27 MY Bruno Fischer The Fingered Man / Hal Braham (as Mel Colton) Double Take (1953) D-29 MY Ross Laurence The Fast Buck / J. F. Hutton Dead Man Friday D-33 MY Carl G. Hodges Murder By The Pack / Frank Kane About Face D-37 MY Marvin Claire The Drowning Wire / Will Oursler Departure Delayed (1953) D-40 MY Cornell Woolrich (as William Irish) Waltz Into Darkness / Malden Grange Bishop Scylla D-41 MY Day Keene Death House Doll / Thomas B. Dewey Mourning After (1953) D-45 MY