Seventy years on, mystery still surrounds the disappearance of Swedish diplomat Raoul Wallenberg who saved tens of thousands of Jews from the Holocaust, though his family is certain the answer lies with Russia.
The young diplomat went missing on January 17, 1945 after being summoned to the Soviet headquarters in wartime Budapest.
Historians, experts and relatives have long questioned circumstances surrounding his disappearance as well as Soviet assertions that he died two years later in a prison beneath the secret service headquarters in Moscow.
But Wallenberg's 93-year-old half-sister Nina Lagergren is unequivocal.
"It is possible to find the truth," she told AFP, remembering her older sibling as "funny and warm".
In 1944, Wallenberg was sent as a special envoy to the capital of Nazi-controlled Hungary and by early 1945, had issued Swedish papers to thousands of Jews, allowing them to flee the country and likely death at the hands of the Fascists.
Several months before the war ended, the Soviets invaded Budapest and summoned the Swede to their headquarters. He was never seen again.
Lagergren, like some experts on the Wallenberg case, is convinced the truth about her brother's fate is hidden in Russian archives.