Introduces the themes of empire and overseas enterprise, specifically shipping and telegraphy, as engines of social mobility, of expatriate opportunities for the British working and lower middle classes, and a related love story created by conditions of expatriate life in the Middle East, particularly Persia. It reviews imperial historians’ focus on informal empire, stressing Robert Bickers’ concept of non-elite ‘other ranks of empire’. David Lambert and Alan Lester’s concept of imperial ‘careering’, and of expatriate experience forging a ‘transformation of identity’, points to the book’s key characters as ‘agents of imperialism’: William Cooper in telegraphy, Edgar Wilson in river shipping and William’s daughter, Winifred Cooper, exploiting expatriate opportunities for independence, and eventually married to Edgar. The key source, a rich British Library archive, yields intimate insights, through letters and diaries, into familiar social history themes like class, marriage, gender and sexuality, and an argument about expatriate social mobility into retirement.