Marty tries his luck in the tough London criminal scene, setting up the smuggling of 75,000 LSD tabs. The Syndicate becomes more organised as Detectives Charlton & Derwent are assigned to the Special Investigations Unit.

Marty Johnstone's criminal career gets a boost when he makes contact with a supplier of Thai cannabis sticks. With his new business associates, Terry Smith and Big Ari, he builds a drug empire. Detectives Charlton & Derwent help with Marty's arrest.

Andy and Marty arrange their first big blue-water shipment out of Thailand. The SIU has major setbacks with building a case against the Syndicate and Josh Easby, a reporter at the Auckland Star, realizes he may be onto something big.

Marty is living the high life, but his addictions to drugs mean that mistakes are being made. Terry Clark begins plotting to cut Marty out of the New Zealand drug market. Ben and Carole are frustrated by the powers-that-be, and the drug war gets personal.

Marty desperately tries to clean himself up to get back on top. The Auckland Star investigation continues and it puts pressure on both the police and Marty. Terry has Pommy Harry killed, as the tensions between himself & Marty reach boiling point

Andy reluctantly starts the preparations to kill Marty, who is trying to set up one more deal. Andy lures Marty to Scotland and kills him, bringing the police case to an abrupt end.