The book follows a single day in Henry Perowne’s life, beginning before dawn in the morning when he finds himself awake for no apparent reason, to late at night when he has just returned home from being on-call in the ER. Henry is a middle-aged man who really is very lucky: He is a highly-regarded brain surgeon in London who remains in love with his wife of over-20 years, and has two grown-up children who are both successful in their careers. He is not emotionally troubled, nor is he dissatisfied with his life. Why then, he wondered, was he aroused from his slumber and unable to return to sleep?
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