The body of a university undergraduate, Josh Tate, is found dumped in a ravine, stabbed with something like a screwdriver. His flatmate, Spencer, says Josh was the quiet type - he last saw him heading off to his part time job at the uni lab. As the team piece together his movements, a picture emerges of another Josh, who was infatuated with his friend Spencer's lap-dancer girlfriend Melanie and was manufacturing ecstasy for club owner Fallon with the help of his biochemistry tutor.