On a small island, four teenagers playing in a cemetery, but decided to do so in the midst of a massive thunderstorm. Suddenly lightning hits a tombstone that splits in two, causing a crack in the ground. Stone relates to a tragic event in the island’s past when a rebel priest led more people in a mass ritual suicide.
Before young people leave, one of the group, Will decides to relieve herself on the stone destroyed. Meanwhile a strange mist rises from the ground and attacking him, turning it quickly in the body. While Hal police chief investigating the incident, one of his men falls into the mist. Hal must team up with his wife, Ashley, which was separated, to fight with aggressive fog that seems determined to take the lives of all the inhabitants of the town one by one.