User blog comment:John-E/A Murdress's Brat/@comment-1421927-20091024021857

Right. I'm English (American English), and Murderess, if it was possessive, which it would be if it was her brat, would be Murderess', because you wouldn't say Thomas's train, you'd say Thomas' train, the short way of saying the train of Thomas. Since you're saying the Brat of the Murderess the short way, it would be the Murderess' Brat.

I like the story, though! Sorry to knit-pick :P