The Satan Bug x 12

1961 Collins hardcover, true first with original title – cover designed by Pino Dell-Orco

1962 Collins hardcover, 2nd printing

1962 Scribners hardcover in the US

1963 Fontana reissue

1963 Popular Library reissue, a paperback original in the US

the back of the book gave away the author’s true name

1964 Fontana reissue

1968 Fontana reissue – cover art by Renato Fratini

1970 Fawcett reissue – cover art by Bill Johnson

1973 Fontana reissue

1974 Fontana reissue

1978 Fawcett reissue

2008 Sterling reissue

The Golden Gizmo x 4

1954 Lion paperback original

a truly dreadful pulp illustration by Robert J. Lee

better image than previously posted

1989 Mysterious Press reissue

1998 Black Lizard/Vintage Crime reissue

2012 Hachette audio cover

1960 Crest reissue – cover art by Charles Binger

originally published as Duo: The Girl with a Secret and Incident at a Corner, 1959 hardcover by Coward McCann, this the later 1960 Crest paperback of just one of the novellas

cover art by Charles Binger

better image than previously posted