Josua Ossendrijver (*1943) was taken to a hiding address immediately after his birth by his Jewish parents, Simon Ossendrijver and Rosette Sanders, and entrusted to the Rotterdam couple, the Slegts. From that moment on, he was called Klaas Slegt. Throughout his life, he kept asking himself: who am I really? There are clues, but they remain vague. His foster parents never answer his questions. A long search follows, and only in 2010—at the age of 66—does he learn his birth name. Since that discovery, he has lived under the name his biological parents gave him. They and his brother David were murdered in Auschwitz in 1944. Josua shares his life story in Dutch schools. Ossendrijver made his literary debut in 2014 with his autobiography “Verdoezeld Verleden” (Concealed Past); the book served as the basis for the theatre play “In Vrede” (In Peace), which was performed in theatres across the Netherlands.