Have to drop this series here. I dunno man, I don't mind the action picking up, excessive violence, or some characters biting it here and there. But the way they set up the little sister as being a sort of misunderstood character who's actually incredibly likable, (suddenly defying the expectations of all the nobles and social standards that she's supposed to uphold, for the sake of her sister,) only to immediately have her brutally murdered was awful. I was kind of hoping she'd become one of the main characters from there, or at least a supportive reliable ally. Instead, she's killed off. Not a fan.
It doesn't give that, "Ooo, I'm upset at this turn of events so I want to keep reading to see what happens next / watch someone get their comeuppance," feel. It only gives that, "Wow, that sucked. I just feel bad after reading that. All interest, immediately gone. Time to stop reading."