With nearly a century of life behind her, Stella Levi had never spoken in detail about her past. Then she met Michael Frank, who asked her about the Jewish neighborhood on the Greek island of Rhodes, where she had grown up. Neither could know this was the first of 100 Saturdays over the course of six years that they would spend in each other's company. As Frank crafts a portrait of Stella, she evokes a little world that vanished in the Holocaust, and Maira Kalman contributes characteristically charming illustrations.