The title was changed in the U.S, but in the U.K. it was called "Ten Little Niggers" well into the '90s. The story took place on "Nigger Island"; all such references were edited out.

I have a mid-80s copy of "Ten Little Niggers." It's not any more offensive than (say) Mark Twain's "Nigger Jim," who was by far the smartest guy in the Huck Finn / Tom Sawyer books. Those were just very different times, and the writing has to be taken in context.