2007: As the wife of billionaire real estate mogul Alistair Calloway, Grace Calloway’s life looks golden. She has an Upper East Side penthouse, a sumptuous lakeside mansion, two lovely daughters, and a doting husband. What reason could there be for her to vanish without a trace?

2017: Seventeen-year-old Charlotte “Charlie” Calloway is bright, beautiful, and privileged—just like many other students at New England’s prestigious Knollwood Prep. At Knollwood, Charlie has found a sense of belonging to fill the emptiness left by her mother’s disappearance. And this semester, she’s been tapped by the A’s—Knollwood’s most exclusive and mysterious society.