A teenager girl goes missing, an internet pedophile ring are the chief suspects. An explosion kills the main suspect. The team race to find the girl before she is killed.
George Webster (the first and second seasons main villain) gets a hold on Gerry and the rest of the team discover heroin-smuggling group linked to a Chinese restaurant in London's Chinatown, run by a Triad syndicate.
Diane discovers products made from endangered species, as a spilt container reveals animal horns. Eddie begins smuggling gold for George Webster. Heroin shipments arrive from Hong Kong.