Part two of an investigation into a series of murders of members of an Internet dating agency. Garth falls back on a part he has played before – that of a sex offender – in an attempt to get close to Grendle, but his attempts to lure Grendle into revealing his secrets backfire spectacularly. Exasperated by Liam's womanising, his estranged wife, Pam, joins the very same Internet dating agency unwittingly sets herself up as a potential victim. The series reaches a terrifying climax as it transpires that the real killer is much closer than anyone realises.