A Killer Story review – this tale of two relentless armchair detectives is prestige true crime

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Eileen and Keen Umbehr were convinced the wrong person was convicted for double-homicide. After sending Pulitzer-winning journalist Joe Sexton 2,714 emails about it, he agreed to investigate – and it led to a messy entanglement HBO is no stranger to true crime, though its offerings tend to be more prestige than your average, with documentaries such as the unrelenting sex cult nightmare The Vow and The Yogurt Shop Murders, a measured reinvestigation into the deaths of four teenage girls in Texas