Black Widows marks Cate Quinn’s move from historical novels to thrillers. It shifts between the very different voices of each of Blake’s wives, as more about the dead man is revealed. “You’re implying my husband deliberately chose women without families?” Rachel asks the police in Salt Lake City. “It’s a very common practice in cults, sects, places where people are brainwashed,” they reply. The women also learn more about their own pasts. “Ever since Blake died, I feel as though someone is peeling up corners of my mind, like the label on a jar. They’ve picked at the edges, but now they’ve got a good hold, and the label is starting to roll back. Sometime real soon, the underside will be exposed.” This is a compelling read with a very dark heart indeed.