One of the most puzzling things about PTSD among American veterans is that the majority never even saw combat - yet they feel deeply alienated back home. The reason may lie in our natural inclination to live in groups of thirty to fifty people who are reliant on one another for safety, comfort and a sense of meaning: in short, the life of a soldier. A book about why men miss war, why Londoners missed the Blitz, and what we can all learn from American Indian captives who refused to go home.