Richie's friend Gary holds up a bank while under the influence of a mind altering drug and dies from the drug shortly after. Duncan remembers effects of a similar elixir that immortal Kiem Sun worked on in the past. Kiem Sun tried to perfect the drug to better mankind. Duncan tracks down Kiem Sun for information while Richie goes back to the streets with former friend Angie to learn what happened to Gary. Kiem Sun has been living on holy ground trying to perfect the drug and tells Duncan that a mortal student, Chu Lin, stole the drug. Richie, MacLeod, Angie and Kiem Sun follow the trail that leads to Chu Lin. MacLeod duels with him and gets rid of the drug. Kiem Sun then turns on MacLeod as his reasons for perfecting the drug along with his ideals have changed.