Dani and her brother Kirk search for her friend Gina, who mysteriously skied off into an isolated area near their mountain home. They don't find her, but then Dani begins seeing Gina appear and beg for help in mirrors and on TV, so goes out again. She and Kirk find an abandoned cabin with an old woman who says she is Gina, aged after an encounter with something called the Aumbra. The Aumbra already took the life of the ski-patroller Gina followed, and can only be stopped by light - but with a thunderstorm approaching as night falls, and wood and flashlight batteries running low, they have to keep it at bay until dawn so it doesn't prey upon Dani next.
—brainybrailler@comcast.net