Ramsey Campbell's Ghosts Know is a fascinating exploration of the twists and turns of reality-media personalities, the line between the dead and the living…and how the truth can be twisted to serve all manner of reality.
Graham Wilde is a contentious, bombastic host of the talk radio program Wilde Card. His job, as he sees it, is to stir the pot, and he is quite good at it, provoking many a heated call with his eccentric and often irrational audience. He invites Frank Jasper, a purported psychic, to come on the program. He firmly believes that the man is a charlatan, albeit a talented one. When Jasper appears on his show, Wilde draws upon personal knowledge about the man to embarrass him on air, using patter similar to that which Jasper utilizes in his act.

Wilde's attack on Jasper earns him the enmity of his guest and some of the members of his audience. He next encounters Jasper when the psychic is hired by the family of a missing adolescent girl to help them find her. Wilde is stunned and then horrified when Jasper seems to suggest that he might be behind the girl's disappearance.
Thus begins a nightmarish journey as circumstantial evidence against Wilde begins to mount, alienating his listeners, the radio station, and eventually, his lover. As Wilde descends into a pit of despair, reality and fantasy begin to blur in a kaleidoscope of terror….