Arriving at Auschwitz in 1944, twin sisters Pearl and Stasha Zagorski take refuge in each other when they become part of the experimental population of twins known as Mengele's Zoo, where they experience horrors unknown to other inmates.

A description of what happened at Auschwitz, a concentration camp in Poland used during World War II by the Nazis to gather and murder many people, mostly Jews.

When the tolerant culture of Spain is shattered by the Inquisition, Isabel feels safe because of her Catholic upbringing and father's position as a respected doctor, until he is arrested for the family's secret Jewish heritage.

Draws on years of forensic and archival detective work to illuminate the open-air massacres of World War II Ukraine as reflected in a Holocaust Memorial Museum photograph of a family murder.