As the series hurtles to a climax, Lennox makes a shocking discovery that turns the case on its head; all is not as it seems and the truth behind these murders lies closer to home.
As Lennox wrestles with the consequences of his actions, the hunt to catch the killer ramps up when one of his own team is targeted. Lennox and Drummond look back at a 1992 case.
Lennox interrogates S&M den owner Richie Gulliver; Gillman and Leblanc are able to identify the man who murdered Fabienne and Gaston; Lennox begins to feel the strain of the case.
The case continues to evade Lennox; he has a connection between the victims but can't find a motive. As he struggles to find answers, Lennox's past trauma comes back hard.
The attacker floods the internet with their manifesto and declares there will be a third victim. The race is on for Lennox and his team to prevent another death.