London, 1878. Thick fog hides secrets... and crimes.
Nathan Blauth, newly graduated and full of ambition, finally gets the chance to prove his worth when he is assigned to investigate an opium trafficking network that is corroding the alleys of London's suburbs.
But there is one obstacle: his partner is Eric Félix, a seasoned veteran, ruthless... and incapable of working as part of a team.
Amid mistrust, dangerous investigations, and chases through the city's narrow streets, Nathan finds himself not only confronted by a past he tried to forget, but also by unexpected feelings: a silent and dangerous passion for the man he swore not to trust.
In a London consumed by fog, addiction, and desire, uncovering who is behind the trafficking may be less risky than discovering himself.