An unimaginable scene of horror awaits St. Louie when he stumbles upon the murder of the British ambassador. Initially intended as a peaceful escape, his unexpected arrival in Paris turns into a terrifying descent into a world of shadows and deceit. In contrast to Reeves Giallo, the chief detective of the Paris police, he is thrust into the heart of a complex investigation.

A deadly game of cat and mouse ensues between these unlikely allies. Their pursuit leads them from Paris' opulent boulevards to the grim industrial heartland of Birmingham, England in 1913.

In their investigation, they discover a ruthless Birmingham gang, a network of criminals who are orchestrating a crime spree beyond the city's borders. Blood and betrayal weave a complex tapestry of intrigue, leading them down an unpredictable path fraught with peril.