AUSTIN — HBO’s Beware the Slenderman documentary, which made its world debut at SXSW on Friday night, is your next Making a Murderer and Jinx-style true crime obsession.

But unlike the other two series, Beware the Slenderman isn’t a who-done-it story. With front-loaded confessions from two 12-year-old girls who attempted to kill their friend after believing in the Internet’s boogeyman (named Slenderman), the chilling film explores the malleability of adolescence, coupled with mental illness and the impact of finding things in the deepest, darkest parts of the Internet.

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HBO’s ‘Beware the Slenderman’ is your next ‘Making a Murderer’ obsession