In the spring of 1956, Deborah, Duchess of Devonshire, youngest of the six legendary Mitford sisters, invited the writer and war hero Patrick Leigh Fermor to visit Lismore Castle, the Devonshires’ house in Ireland. The halcyon visit sparked a deep friendship and a lifelong exchange of highly entertaining correspondence. When something caught their interest and they knew the other would be amused, they sent off a letter—there are glimpses of President Kennedy’s inauguration, weekends at Sandringham, filming with Errol Flynn, the wedding of Prince Charles and Camilla Parker-Bowles, and, above all, life at Chatsworth, the great house that Debo spent much of her life restoring, and of Paddy in the house that he and his wife designed and built on the southernmost peninsula of Greece.