Again, I didn't quite grasp the meaning of the title, even at the end, after finished reading it.
This one, being also the first before last in the series with detective Murdoch (no. 7 out of 8) , nailed the ferm conclusion that my wait to see Murdoch and dr. Julia Ogden are to meet and fell inlove with each other, as they do in the TV series is totally in vain - this clearly will not happen; they do meet, finally, quite a few times here, but they behave so "stiff" with each other, practically only at professional level, that I really don't understand why the TV series decided they should be together in a couple (and even marry and have a child in the latter part of the series). The epilogue is quite clear on this matter: when Amy announces Murdoch that she is pregnant and she accepts, finally, his proposal for marriage, they refer to dr. Ogden as sort of boogieman that is to be avoided at all costs :-)) )
But, nonetheless, I was puzzled to see how Julia spoke to Murdoch calling him William, without prior asking for permission to be this familiar with him, while he was responding to her strictly with dr. Ogden (alas, he calls her that way even in the series when they are already married, while referring to her in discussions with other people).
Okay, the action in this one is pretty dense, and the starting point is a sad and partly true story about a black girl sold to slave dealers by her own, fresh, husband ! She take her revenge on him, later, in her old days, while suffering from a terminal disease.
And Murdoch has a hard time coming to understand the clues and learn about the author of the terrible crimes made out of this revenge (her husband not only killed, but being whipped savagely, just as herself was, while being a slave in America).