AmsterdamAfter more than two years of hiding above her father’s warehouse, Anne Frank and seven others were discovered by Nazi German and Dutch officials on August 4, 1944. The search for who—or what—might have exposed their location continues 75 years later.

Today, historians, data scientists, and even a cold-case forensic team are using new technology to identify the informant—with some suggesting that, perhaps, Frank was discovered by accident.

Frank’s diary, The Diary of Anne Frank, which she wrote from age 13 through 15, is the most widely-read text to emerge from the Holocaust. For the Netherlands, her story of common citizens risking their lives to help those in need has become the most prominent narrative of the Dutch’s involvement during the World