"For those of us who have long wondered what is going on in the unusual brain of the British thriller writer Sophie Hannah, her entertaining recent work of nonfiction, How to Hold a Grudge is a perfect document. It explains, among other things, her relish for parsing human motivation down to the subatomic level and her characters' tendency to respond to normal events with abnormal behavior that holds some internal logic for them (and for her, since she made it up) but seems wackadoodle to the rest of us." --Sarah Lyall, The New York Times