I do love Conrad and this book is one of the best up until the last few pages where the climax is both hurried and does not really work. The slow boil that happens in the rest of the work is fantastic. There is brilliant character building and Conrad takes a very informed walk through a few kinds of evil people. The writing is wonderful and invokes, as one would expect, the exotic locale and sense of isolation. If it wasn't for the ending which does not really come together some how and involves at least two deaths which didn't make a whole lot of sense to me.
Otherwise very good. The ending stops it from being one of Conrad's best, but otherwise a typically magnificent work.