In deep Louisiana, a serial killer with a taste for medical experimentation is completing his most ambitious project yet. The media call him 'The Butcher' - and, so far, he's proved impossible to catch. With her encyclopaedic knowledge of humanity's darkest minds, and years of experience examining their victims, forensic pathologist Dr Wren Muller is the best there is. The longer the Butcher's killing spree continues, the more determined she is to bring him to justice. And yet, he continues to elude her. As body after body piles up on Wren's examination table, her obsession grows. Pressure to put an end to the slaughter mounts. And her enemy becomes more brazen.