As we reach the half way point (in the series, not the tunnel, that'd be treading on murderous territory again innit?) Benji carries out his Samurai mission, while Karl and Elise hope to use teenage runaway Sophie as bait to help trap the killer. Meanwhile, Chuks confiscates Stephen Beaumont's laptop, hoping it will reveal information about Veronica's whereabouts. We'll never be able to set foot in that tunnel after all this...