In this novel by Charles Grant, Mulder and Scully are joined by two other agents tracking down a seemingly invisible killer.

Frank Black engages in a battle of wits with a bomber.

Frank is called in to investigate when body parts are sent in the mail to seemingly random people.

Frank travels to Portland, Oregon to track a serial killer, and works with an officer being considered for employment by the Millennium group.

Mulder and Scully investigate a series of murders, in which the victims appear to have been skinned alive.

Frank is called to San Francisco to investigate serial killings that lead him to a cult.

Meet Frank Black, and man we've met before when this series had its final episode as a part of The X-Files in season 7.

Mulder and Scully investigate missing teenage girls who were obsessed with an unhealthy "romance" in a series of vampire novels.

Scully needs to investigate alone to find a missing Agent Mulder.

Skinner needs to convince the accounting department not to shut down the X-Files.