The Tale of the Shimmering Shell is a novella written by David Cody and Bobbi J. G. Weiss. It was twelfth book in the Are You Afraid of the Dark? book series and was first published in 1997.
Description[]
"Why can't you all just go away and leave me alone!"
Glynis Barrons is about to wish she'd never uttered those fateful words to her father, stepmother, and brother. The four of them are vacationing in an isolated bungalow on Seawrack Island, and Glynis has had about enough of her new family. Little does she know, however, that her anger will be powerful enough to summon a dark force from its prison deep within a shell...a force that has been festering for many years, eagerly awaiting its chance to break free and resume its evil reign.
Sure, Glynis wants everyone to disappear for a while. But not forever...