I accidentally read an advertisement of a thesaurus saying that...
This all-new edition of the classic reference work is the one thesaurus no home or office should be without.
To me, the sentence soulds natural, yet, on the secound thought, I found no and without in the sentence which makes me think that this sentence might have a double negative problem.
Is it really a double negative? If so, is it acceptable as allowed to appear on the back cover of a quite well known thesaurus?