The Second World War had been under way for a year when Marie and John Williamson welcomed two English brothers to join them and their two children in their small house in north Toronto for the duration of the conflict. Marie wrote over 150 letters to the boys' mother, Margaret Sharp, imagining that she could make Margaret feel she was still with her children. She shepherded the boys through education decisions and illnesses, eased them into a strange new life, and rejoiced when they embraced unfamiliar winter sports. The letters brim with detail about family holidays, the financial...