In the final months of World War II, ten-year-old Peggy shelters with her mother and baby brother in a London butcher's shop during an air raid. They survive, but their home and everything in it are lost, including Peggy’s most treasured possession, a biscuit tin of letters from her father. Their lives change dramatically and Peggy makes friends with a boy named Spud who has a passion for scavenging bombsites, leading to more than one surprising discovery.