Berserker

Et nyt stof, der får anabolske steroider til at ligne vitaminpiller, er i omløb i Glasgows bodybuildermiljø. Et stof, der giver enorme muskler. Men også et stof, der kan forvandle brugeren til en rasende galning. Og et stof, der hvirvler Taggartholdet ud i en række brutale mordsager.

Illegal body building drugs combined with mind bending additives cause a series of deaths around the muscle scene in Glasgow. In a race against time to find the source of the deadly drug the Maryhill team call on the help of a famous chemistry professor at the University. But is he helping or is he the source of the drug?