Anne Frank lived two years in hiding while she wrote her now-classic diary, and her family's 1944 arrest by the Nazis has long been attributed to the work of an unknown betrayer. But a new study published Friday by the Anne Frank House museum in Amsterdam "illustrates that other scenarios should also be considered" — in other words, perhaps no traitor has been definitively identified because none existed. The fresh research suggests Sicherheitsdienst agents were not intentionally looking for hidden Jews, but simply investigating food ration fraud.