When she was very young, Irene Kacandes knew things about her father that had no plot, no narrator, and no audience. To her childhood self these things resembled beings who resided with her family, like the ancestresses who’d thrown themselves off cliffs rather than be taken by the Turks, or the forefathers who’d fought the Trojans. For decades she thought of these cohabitants as Daddy’s War Experiences and tried to stay away from them. When tragedy touched the adult life she had constructed for herself, however, she realized she had to confront her family’s wartime past. Kacandes begins with what she did know: that her immigrant grandmother returned to Greece with four young children—and without her husband—only to get trapped there by the Nazi occupation. Though still a child himself, her father, John, helped feed his younger siblings by taking up any task possible, including smuggling arms to the Resistance. Kacandes painstakingly uncovers a complex truth her father chose not to...