Throughout her life Sybil Van Antwerp has used letters to make sense of the world and her place in it. Most mornings around half past ten Sybil sits down to write letters--to her brother, to her best friend, to the president of the university who will not allow her to audit a class she desperately wants to take, to Joan Didion and Larry McMurtry to tell them what she thinks of their latest books, and to one person to whom she writes often yet never...

In Purity, Maine, former spy Maggie Bird and her Martini Club of ex-CIA operatives are drawn into the search for a missing teen with ties to their past, as they confront an innocent friend's wrongful suspicion, a buried corpse, and dark secrets that threaten to unravel everything they've worked to protect.