PARIS.

An old mystery.
As midnight strikes, a man desperately seeking sanctuary flees into a church. The next day, his sudden disappearance will make him famous throughout France.

A new science.
Forensic expert Enzo Macleod takes a wager to solve the seven most notorious French murders, armed with modern technology and a total disregard for the justice system.

A fresh trail.
Deep in the catacombs below the city, he unearths dark clues deliberately set - and as he draws closer to the killer, discovers that he is to be the next victim.