Nicci French is a British writing duo composed of journalists Nicci Gerrard and Sean French. They have written numerous psychological thrillers, including the popular Frieda Klein series. Their books have been translated into over 30 languages and have sold millions of copies worldwide. They have also written several standalone novels, including The Safe House and The Other Side of the Door. Nicci French's books are known for their complex characters, intricate plots, and suspenseful atmosphere. They have won numerous awards, including the CWA Dagger in the Library Award and the WH Smith Thumping Good Read Award. Their work has been praised by critics and readers alike for its gripping storytelling and psychological insight.