The previous story was absolute fun, but this one is just simply great storytelling. And, wow, I had forgotten how dark this got, with the slavery, the murders... but, man, the roboman recognizing his brother just as they kill each other really got me.
Not to mention the end, of course. Susan may not have been the best written character, but they handled her last stories leading up to her departure pretty well. It made sense and was shocking at the same time. Can't believe I cried again.