Murdoch suspects an athlete died from large doses of a mysterious stimulant.

As Murdoch seeks a promotion, a constable is shot in a botched raid on an opium den led by Watts.

Watts kills a man in self-defense, then Murdoch uncovers the victim’s criminal past.

After a death-bed murder confession leads to a body, Murdoch suspects the true killer is still out there.

Detective Murdoch fears that his relationship with Dr. Ogden has been permanently damaged, as he heads into investigating a seemingly perfect crime, the murder of a university professor. Meanwhile, Constable…