Henry Perowne is the protagonist of Saturday. The novel stays close to his perspective and thoughts throughout the events of the day. He is a successful neurosurgeon in his late forties who lives in London with his wife, Rosalind, and son, Theo. On top of his successful career, Henry enjoys a loving relationship with his immediate family and a passionate, committed marriage.

Henry is a highly rational and analytical person, which is evident in his profession as a neurosurgeon. He is also a keen observer of the world around him and is constantly reflecting on his experiences and emotions to mine for deeper meaning. Henry’s rationality and intelligence are reflected in his love for science and his habit of thinking through the variables of every situation. Throughout the novel, Henry is portrayed as a man who values order, routine, and control. He is an early riser and enjoys his weekly routines, which include running and playing squash.

Henry’s life is disrupted on the day the novel takes place when he is involved in a minor car accident that leads to a confrontation with a violent and unpredictable man. This event challenges Henry’s sense of control and his certainty of the world around him.