Patricia Highsmith was an American novelist and short story writer widely known for her psychological thrillers, including her series of five novels featuring the character Tom Ripley. She wrote 22 novels and numerous short stories throughout her career spanning nearly five decades, and her work has led to more than two dozen film adaptations. Her writing derived influence from existentialist literature, and questioned notions of identity and popular morality. She was dubbed "the poet of apprehension" by novelist Graham Greene.