Unknown Person

When a team of explorers venture into the catacombs that lie beneath the streets of Paris, they uncover the dark secret that lies within this city of the dead.

A television reporter and her cameraman are trapped inside a building quarantined by the CDC after the outbreak of a mysterious virus which turns humans into bloodthirsty killers.

When hundreds of videotapes showing torture, murder and dismemberment are found in an abandoned house, they reveal a serial killer's decade-long reign of terror and become the most disturbing collection of evidence homicide detectives have ever seen.