Liam and Garth try to crack a paedophile ring which is operating through a sophisticated website. Liam befriends the wife of the webmaster and Garth goes undercover in prison to make contact with two of the principal players. After winning their confidence, he discovers that a grisly crime is about to be committed.

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A woman is found murdered in her flat in almost identical circumstances to one six months earlier. The victims have one thing in common – they are both members of the same Internet dating site. Kelly goes undercover and builds up a relationship online with prime suspect Dark Angel, but her tactics come close to entrapment. Liam's colourful love life threatens to compromise the operation when a spurned girlfriend starts to stalk him.

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.

Liam and Garth go undercover to gain the trust of an arrogant armed robber. But as they are sucked into his brutal world, it becomes unclear who is manipulating whom.

Liam and Garth struggling to keep their cool on an undercover operation against armed robber Sean Denning as the court hearing approaches.

Liam and Garth pose as security consultants in order to protect a controversial gay Home Office minister who has received death threats over his plans to legalise cannabis. Meanwhile, Liam's daughter's boyfriend offers information to drug dealers about Liam and Garth's operation in order to pay off his drug debts.

The threat to government minister, Jertemy Church's life becomes more real, with a controversial speech on drug laws looming. As Liam and Garth find themselves under mounting pressure to protect him, those closest to Jeremy Church appear to have scores of their own to settle.