Toady

Welcome to the Horror Club: a world of werewolves and poltergeists, psychopaths and shape changers, the unquiet and the living dead... A fantasy world, of course, for Richard, Robin, and Nigel, the club's members are ordinary boys from ordinary families, who just happen to share a taste for the macabre in films and videos, books, and comics. And then they admit a fourth member to their club - Toady, a far-from-ordinary boy with a taste for the macabre in real life.
From the moment he lures the others into a nerve-jangling séance in a house with a chilling reputation, their lives are blighted by worse horror than they have ever imagined. In a fusion of nightmare and reality, terror stalks the familiar streets of a sleepy seaside town and waits to invade the safest home. The pervasive stain of evil spreads like ripples on a pond, leaving a trail of sacrilege and death in its wake.
One by one the members of the Horror Club are overcome and forced into a netherworld, halfway between illusion and reality. It is up to the final member to fight alone against the evil they have unleashed - until, in the final battle, he is joined by an unexpected ally.