When Michelle, the CEO of a gaming software company, is attacked in her home by an unknown assailant, she refuses to let it alter her precisely ordered life. She manages crises involving family, all the while becoming engaged in a game of cat and mouse with her stalker.

A group of friends on vacation decide to venture onto a trail high up in the mountains that has been closed for repairs. The climb proves more perilous than planned, especially as they soon realize that they are not alone. The adventure turns into a nightmare.