do they publish books of different genres?
Yes, of science fiction, mysteries and westerns combined,  lurid juvenile delinquent novels
Ace Books
 mysteries and westerns combined. Ace also published a number of lurid juvenile delinquent novels
what does 'ace books' mean? A publisher of science fiction and fantasy books who founded it? Aaron A. Wyn name some of the famous books they have published? William Colt MacDonald's "Bad Man's Return", P. G. Wodehouse's "Quick Service what is the genre of the latter work? UNANSWERABLE when was it published? 4 October 1940 what sort of struggles did they face financially? After the death of Wyn, the company grew financially overextended, failing to pay its authors reliably.
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Ace Books [SEP] 1953–1963: Genre specialization
By 1955, the company released more SF titles each year than in either of the other two genres, and from 1961 onward, SF titles outnumbered mysteries and westerns combined. Ace also published a number of lurid juvenile delinquent novels in the 1950s that are now very collectible, such as D-343, "The Young Wolves" by Edward De Roo and D-378, "Out for Kicks" by Wilene Shaw. By the late 1950s, Ace's output was approaching one hundred titles a year, still heavily dominated by the primary genres. Almost all the books were 35 cents, though some slim single volumes were 25 cents, and a handful were half a dollar.