Whispering — Jane Aiken Hodge

When teenage Caterina Gomez returns from England to Portugal, she comes back to a beloved homeland, a distant father, and a scandalous past. Traveling with Caterina are her cousin Jeremy Craddock, a young Englishman seeking a cure for his ill health, and her dear friend Harriet Brown, who is on the run from an arranged marriage. This unlikely trio arrives in a Portugal rife with tension, for the country is at war with France, and Oporto, recently liberated, is a city in ruins and full of bitter memories. Caterina's hopes for happiness are initially frustrated, for her father seems determined to see her married or in a convent. Then the note arrives, a voice from the past that changes everything and send Caterina into the center of political and romantic intrigue. Drawn into the tangled web that binds the Portuguese and English communities together in an uneasy alliance, she discovers that no one is quite what he seems.