Serangoon Road S1 05: Episode 5
When Claire discovers that the medicine by Maxwell Black's company to children at a small village hospital is not working, she insists that the company investigate the problem. Sam somehow manages to prove that the genuine drugs are being diluted. He also goes on to find out that families will eventually turn to expensive black market substitutes when they realize the ineffectiveness of the hospital medicine. Further investigations help Sam to recognize that this is all part of an elaborate scam run by the Secret Society.