The crime scene has been scrubbed clean, leaving them with few clues. There is no doubt: this time, they are dealing with a professional. Alongside their investigation, they welcome an officer from the IGPN, who has arrived to lend a hand in tracking down Lebrac’s killer. The leads grow increasingly muddled as the investigation proceeds, until Phil puts forward a hypothesis: the two murders might be linked.

The show’s own verdict is on its page.