The Bureau of Dark Affairs 3. Nights of Blue Horror

Paris, 1832. A terrible cholera epidemic strikes Paris, affecting primarily the poor and spreading panic. The city is engulfed in rumors and fear, while the people grumble against the measures introduced by the government.
While the authorities and medics try to control the cholera outbreak, a new disaster befalls the capital — corpses with stab wounds begin to be found in the Saint-Merry district.
The investigation of the mysterious murders is entrusted to the Bureau of Dark Affairs under Inspector Valentin Verne. He is assisted by his loyal Aglaia, along with two newcomers: the Trickster — a repentant con man and master of deception, and Tafiq — a former mamluk of the Napoleonic army, a true giant.
However, soon events spiral out of control: false leads multiply, scholars are kidnapped, and Vidocq, who has again taken charge of the Sûreté police, finds a way to uncover the true identity of the Vicar
and answer the question that torments the inspector at night: to whom did this criminal serve?