O EM GEE. I read this book in one sitting. The plot twist ?!?!?

I stare at her, too afraid to speak. Too afraid of the next words that will leave her mouth. And when they finally come, it takes my breath away: “It’s such a shame,” she says, “that he never really learned. I’m glad you stepped up and taught him a lesson.”

“So”—Lisa slides the knife back into the wooden block and straightens up, her blue eyes wide and anxious—“can you help me, Millie?” “Yes,” I say. “I believe I can.”