The story of Kristine Keren does not begin with survival. It begins with something very ordinary: A sweater, hand-knit by her grandmother, in a shade of green that would outlast almost everything in her childhood. She was just seven years old in 1943, living in a ghetto in Lvov, Poland, a city that had already been reshaped by fear. At that time, Jewish families were being forced into a ghetto, stripped of work, property and routine. For children, life had come down to the same instructions every day - stay quiet, stay hidden, don't be seen. Kristine, then known as...