Somewhere in Boston there is a doctor who treats disorders of the brain: a brilliant woman, a Harvard graduate, a mother of two. But she has a dark secret.

Unbeknown to her colleagues or her patients, she is also a writer of thrillers, churning them out at a terrific rate, nearly all of them bestsellers. Four were on the Sunday Times list of top-selling books of 2024. One, The Housemaid, is being turned into a film starring Sydney Sweeney and Amanda Seyfried; another is set to be a film too, while a third is to be a television series. Across all formats, and including translations, she has sold 17 million books.