Nicci French is the pseudonym for the writing partnership of journalists Nicci Gerrard and Sean French. The couple are married and live in Suffolk. There are fifteen bestselling novels by Nicci French, all published by Penguin. Blue Monday was the first thrilling story in the Frieda Klein series, followed by Tuesday's Gone, Waiting for Wednesday, Thursday's Child, Friday on My Mind and Saturday Requiem. They have sold over 8 million copies worldwide, and 1.75 million copies in the UK alone.