The Living Force
I'm about 85% through Mary Balogh's Heartless. I feel it is darker than the entire Marriage of Convenience series and Wagers of Sin series combined. I feel like the negative energy is covering me, and I need to get to the end where I presume a happy ending awaits to shed the negative energy. Maybe this indicates Balogh is really good at conveying the characters' terror and pain to me, or maybe I'm reaching a threshold from the culmulative effect of the books on me.