In Russian, the proverb ‘Ignorance is bliss’ translates as ‘The less you know, the better you sleep’. For those who experienced the worst of the Soviet Union’s terrors, this is not just a throwaway adage but a strategy for self-preservation. As Alex Halberstadt’s father — the son of one of Stalin’s former bodyguards — attests: ‘There is no more to be gained from sifting through the past than through cigarette ashes.