With Luther dogged by ghosts from his past, a cold case might be the key to unlocking a mystery that's tormenting him. Meanwhile, with the cannibalistic serial killer still at large, Benny's hacking skills have revealed a list of hundreds of potential victims. Realising it's all part of a macabre end game, the detective is forced to put himself and new colleague Emma into the heart of danger to try and stop the killer.
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