Robert Hunter and Carlos Garcia arrive at the crime scene at dawn.

Behind the crime scene tapes, a white church is hidden in the light of the lamps. It looks like a postcard before Christmas. However, what awaits the two investigators in the building is nothing like that: blood everywhere, a splattered floor, an altar soaked in blood and a corpse in a reverend with a dog's head around its neck.

Who and why turned the Catholic church into a slaughterhouse? What does the number painted on the corpse's chest mean? Wouldn't he be the first victim, will there be more?

The Hunter-Garcia couple tracks down a brutal serial killer, shoulder to shoulder, often going against the orders of their superiors, moving forward unstoppably to see if they can still save someone from the nightmare.

The killer wants nothing more than to make his victims' nightmares come true - because he knows their past, their secrets, their greatest fear, and knows how to make the terror even worse. To the end.