The twelfth in a stylish new series of novelizations of classic episodes from the phenomenally successful cult TV show The X-Files created by Chris Carter.

FBI agents Fox Mulder and Dana Scully investigate the eerie unsolved mysteries the FBI want handled quietly but quickly, before the public finds out what's really out there... and panics. The cases filed under 'X'.

A serial killer is stalking the city, slashing his victims' faces before killing them. But when the murderer is caught, he claims to have been possessed by the spirit of an ancient, malicious gargoyle - one he fears will now possess someone else. When the brutal deaths continue, Special Agents Mulder and Scully are called in. Is this the work of a copycat killer? Or could a demonic force somehow be responsible? Mulder can think of only one way to solve this case: in order to catch a monster, you've got to become one yourself...