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Less a documentary than a historical document, this is the filmed testimony of Shin Dong-hyuk (born into a North Korean death camp) and two of his potential tormentors.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

Matt Glasby is a freelance film and TV journalist. You can find his work on Total Film - in print and online - as well as at publications like the Radio Times, Channel 4, DVD REview, Flicks, GQ, Hotdog, Little White Lies, and SFX, among others. He is also the author of several novels, including The Book of Horror: The Anatomy of Fear in Film and Britpop Cinema: From Trainspotting To This Is England.