After a newly-qualified doctor is discovered tortured and mutilated in an empty warehouse the team soon discover some connections to a drug-trafficking case.
The leader of a ship workers' union is shot dead during a labour dispute and his boss also ends up being shot. Burke and Reid think that it could be a corporate killing but the case ends up being far from clear until some new evidence is discovered.
After Iranian refugee Farid Mamood is burnt to death, it it looks like a racially motivated murder as one of the suspectsis a former soldier with strong opinions about the Mamoods' arrival in the area. Burke believes there is another motive behind the killing and that there is a more complex case on his hands when a local drug dealer enters the mix.
After a father and his three children are discovered dead in a flat there are no witnesses to the crime and the only surviving child is unconscious in hospital. The team at first think that it is an open-and-shut case until the child wakes up and the case takes a shocking twist.
After a boxer is discovered to have been murdered it leads the team into the world of cage fighting, illegal betting and lap dancing.
DI Reid heads the murder investigation after a busker is stabbed to death down an alley in Glasgow. Important evidence ends up showing up in the hands of two art students who were photographing the area at the time. Ross's personal life begins to unravel as the case progresses.