The letter came from Caleb. Not an email—a physical letter, sent across the country to the shelter, addressed to Mira in his careful handwriting. Ruth handed it to her at breakfast, and Mira took it to her room and opened it with trembling hands. She did not know why it was trembling. She had received letters before—she had received many emails from Caleb, and a few smaller pieces of correspondence from other people who had heard about her through Elena's network. But something about a physica...