Smithy puts his neck on the line by digging into Brad Kelso's past, in an attempt to uncover information that will clear Eva's name. Meanwhile, the investigation into Page's cellmate takes an interesting turn when Carver goes undercover as a hit-man in an attempt to gather evidence against her. Webb's investigation into Martin Delaney takes a vicious turn when Delaney takes a dislike to Webb's line of questioning. CID soon becomes a hot plate of unbridled passion when McAllister and Becker offer Hunter the promise of a lifetime - a threesome. Carver's wife turns up drunk at the station and assaults him in front of his colleagues. Harman informs a disappointed Best that their liaison was a one-off.