Dead bodies speak the shocking truth to London University's team of forensic pathologists. Too shocking? A horrific murder may be more than Nikki can bear. A gruesome case in Sheffield puts a strain on Leo's relationship with Janet. And the death of a pregnant prostitute in Budapest holds dire consequences for Harry and his lover, Anna. How to explain the second bullet in the skull of an apparent suicide victim who witnessed a murder in Afghanistan? What's behind the cover-up of a shooting at the Dutch Embassy? Even the answers may leave you guessing in five complex, two-part episodes of the BBC's award-winning crime drama series.