This is how Michael Chabon opens his latest book, Moonglow: “In preparing this memoir, I have stuck to facts except when facts refused to conform with memory, narrative purpose, or the truth as I prefer to understand it. Wherever liberties have been taken with names, dates, places, events and conversations, or with the identities, motivations, and interrelationships of family members and historical personages, the reader is assured that they have been taken with due abandon.”
So caveat emptor – be warned: what you read may or may not be true, may or may not have happened, and the people concerned may or may not have existed.