The Knock

Episode 2

Love and Respect

Child pornography is being smuggled from Thailand. Adams tries to stop it, and Ralston investigates the unidentified plane.

Episode 3

Trouble in Chinatown

George Webster gets a hold on Birch while the team discover a heroin-smuggling group linked to a Chinese restaurant in London's Chinatown, run by a Triad syndicate.

Episode 4

Endangered Species

Ralston discovers products made from endangered species, as a spilt container reveals animal horns. Meanwhile, Barton begins smuggling gold for Webster, and heroin shipments arrive from Hong Kong.

Episode 5

Reason for Concern

Andreotti inadvertently begins investigating an international drug smuggler. Diplomatic issues bring Ralston's investigation to a halt. Birch realises his mistake in working for Webster and tries to escape but it's not so easy.

Episode 6

Show Your Metal

The team follow Barton as he brings gold illegally into the country. Webster decides to up their smuggling operation and take bullion from all over Europe. Andreotti is successful with the Mullvany case.

Episode 7

Hold Me Close

Webster cuts Barton off, so he tries to escape but is chased into the London Underground, where he commits suicide. Birch and Beverley Webster are caught at Dover with the gold hidden in the car bumper.