In the first episode, the foursome head to a laboratory to find out the expected purity of street cocaine and what dangerous substances it can be cut with. They visit a professor who discusses just what happens to your brain and heart after taking the drugs. And the gang head to Colombia to find out about the cocaine trade - where Louis and Amber come face to face with a cartel hitman.
Troi and Chanel witness the unsanitary conditions under which cocaine is made, and discover the ingredients that go into the drugs they routinely use. Louis encounters a cocaine smuggler and Amber accompanies armed officers in the Colombian Navy on duty.
In the final episode, the four users discover the effect Colombia's super-strength drug is having on users in Britain, from an increase in first-time addicts to a sharp rise in overdose deaths. Will they continue to take cocaine for fun?
