A body is found strangled under the Last Judgment portal of Notre Dame. His ears have been pierced and his face positioned so that his dead eyes are aimed at a figure of an angel blowing his trumpet to wake the dead for the final judgment. By making the victim symbolically deaf to the angels trumpet, Jo surmises that this was the killers way of saying that this victim wasn't worth Gods mercy.

During fashion week, the barely-alive body of a glamorous former model is found hanging in the upper levels of the Eiffel towers iron structure. At first, her lover's estranged wife is suspected he apparently wanted to leave the model to return to the mother of his children, but the model refused to let him go. But then Jo finds another trail.

Stunt man Alain 'Spiderman' Robert is found with his neck broken and dressed in climbing gear at the base of the Obelisk. As it turns out, Alain was hired by a rich industrialist to plant video equipment recording a kinky humiliating sex play in a suite of the Crilion Hotel involving the wife of one of France's most prestigious families' heir. However, there is an even more sinister game at stake.

35-year-old Mirage fighter pilot Charlotte Dumas is found dead inside Les Invalides. A person of interest at the time of the LeGoffs killing, is a mechanic in Charlotte's crew. Convinced that the mechanic did kill the LeGoffs, Jo starts unraveling a setup. Faced with a calculating degenerate killer, all is not what it seems.

In a garage under Place Vendome, firemen find a burnt corpse behind the wheel of a car. The cops identify Philip Roquin. His family and employer's testimonies differ: the latter hasn't heard of Philip in two weeks while his wife tells the cops he has been in a car accident. Jo tracks back Philip's trail to discover he was having an affair, which might have led him to his death.

Place Des Vosges, a stone's throw from Victor Hugo's apartment. A young woman is found dead from a blunt-force head wound. Jo deducts the murder was not premeditated, but maybe a crime of passion, maybe the result of a struggle an argument gone bad. Her husband has an alibi, though his general demeanour rubs Jo the wrong way. Maybe she was meeting a lover?

On a sunny afternoon after taking his daughter to her ballet lesson, a middle-aged man gets stabbed on the steps of the Palais Garnier. The victim is an economist and a family man, and everything suggests the murder was random. Soon after however, a teaching assistant to a Political Science professor is found stabbed to death in a similar fashion. Jo finds out that the two murders are linked.

A young woman is found stabbed to death in the Catacombs. Since some parts of the Catacombs are a known hang-out for would-be Satanists, suspicion at first falls on those two groups. But the style of the killing suggests a sexual motive. The victim is identified as a repressed loner who frequented sex bondage clubs - the police thinks that maybe she was in the Catacombs for a sexual rendezvous.