Didn't feel I needed to have read the three previous books to follow this one, except perhaps for the appearance the Uruguayan character Eva, where I felt there had to have been a previous backstory. As for the story itself, I felt it moved s-l-o-w-l-y at times, so that by the time Trotti confronted the killer I didn't really care much, nor really "get" how he got there, but glad it was over. Not to say that the writing itself is dull, but more that the author's pacing isn't what I'd consider ideal. The book did serve to pass time, with characters who varied enough to keep me from feeling a sense of plodding along. As a matter of fact, at some points the narrator varied the voices so much I thought there may be more than one reader!
Would I read the next (final) story? I doubt it. Would I recommend this one? Perhaps to hardcore Italophiles.