Funland, by Richard Laymon

The seaside resort of Boleta Bay is not the carefree place it used to be. A series of unexplained disappearances has brought misery and fear to the local families, casting a dark shadow over the summer. And to add to the atmosphere an unease of foreboding, the tourists who throng the arcades and stroll along the boardwalk now have to pick their way through a growing army of leering, foul-mouthed bums who infest the delapidated buildings of Boleta Bay's promenade.

But now Boleta Bay is fighting back. Convinced that the loathsome down and outs, nicknamed 'trolls', have been abducting its citizens for their own grim purposes, a gang of local teenagers decide to wreak their own violent revenge on what they see as a hive of murderous parasites.

Led by the charismatic Tanya, the gang soon graduate from simple beatings to other, more ambitious forms of punishment. And as they grow more daring, their campaign inexorably leads them to the old abandoned Funhouse, where the appalling truth about the disappearances awaits them.