Less a documentary than a historical document, this is the filmed testimony of Shin Dong-hyuk (born into a North Korean death camp) and two of his potential tormentors.

Besides simple animations, director Marc Wiese makes zero embellishments – this is a film of talking heads, terrible secrets and a creeping sense of how totalitarianism dehumanises us all.

A former guard smirks as he admits to institutionalised rape, torture and murder, while Shin lapses into silences you fear may never end.

A challenging watch, steeped in numbing horror.