Mere blocks from where Bonnie Dahl disappeared live Professors Rodney and Emily Harris. They are the picture of bourgeois respectability: married octogenarians, devoted to each other, and semi-retired lifelong academics. But they are harboring an unholy secret in the basement of their well-kept, book-lined home, one that may be related to Bonnie’s disappearance. And it will prove nearly impossible to discover what they are up to: they are savvy, they are patient, and they are ruthless.