When a newly-qualified doctor is found tortured and mutilated in a vacant warehouse, the team discover connections with a drug-trafficking case.

When shipworkers' union leader Will Ramsay is shot dead in the middle of a labour dispute, corporate killing seems the most likely cause. But the real motivations lie much closer to home.

When three children and their father are found dead in a tenement flat, what initially appears to be an open and shut case becomes something altogether more sinister.

The murder of a boxer leads the team into a murky world of cage fighting, illegal gambling and lap dancing.

Newly promoted DI Reid leads the murder investigation when a busker is stabbed to death in the city centre, but as the case progresses, Ross's life begins to unravel.