Unpublished for 90 years, Agatha Christie’s extensive and evocative letters and photographs from her year-long round-the-world trip to South Africa, Australia, New Zealand, Canada and America as part of the British trade mission for the famous 1924 Empire Exhibition.In 1922 Agatha Christie set sail on a 10-month voyage around the British Empire with her husband as part of a trade mission to promote the forthcoming British Empire Exhibition. Leaving her two-year-old daughter behind with her...