first (?) uk p/b ace (uk) 1960, q.v.
(with four square books ltd, one of the publishers bought by times mirror, los angeles, to create the new english library ltd. as the uk sister company to new american library, which they'd previously bought.)
nel four square crime across top front cover (i.e. in transition to nel/new english library imprint)
cover art uncredited (?), unsigned
cover price 3/6,
(mike don doesn't give pagination, alas)
eleventh and last lemmy caution novel; 1953 edition adds three short stories to the book contents.