An arrogant detective, Charles Courtney, prides himself on never having committed a single mistake in his long and distinguished career. He keeps a shelf of labeled mementos from each of his cases. On the shelf there is an open space and a blank tag for what Courtney calls "The Perfect Crime". One day a defense lawyer stuns Courtney when he confronts him with evidence that the detective helped convict an innocent man who has since been executed. Courtney kills the lawyer, bakes him in a pottery kiln, and places the vase in the open space on his shelf as a memento to his perfect crime.
第二季中，侦探杜尔西·柯林斯（凯特·波克斯 Kate Box 饰）和埃迪·雷德克利夫（玛德琳·萨米 Madeleine Sami 饰）将前往澳大利亚的Top End地区。她们起初在达尔文调查雷德克利夫前任警务伙伴布什的死亡案件，然而在一个偏远小镇发现了两名Top End知名人士的尸体，这开启了一场“更紧张、更棘手”的新调查。
