Annie and her friends are enjoying a lazy day by the lake when ominous dark clouds begin to form on the horizon. In the scramble to escape the storm, Annie realizes her cousin Gina has gone missing. After a fruitless search in the rain, the teens call the police for help. And as the hours tick by, Annie’s fear for Gina’s safety mounts. Haunted by thoughts of the horrible fate that could have befallen Gina, Annie turns to her friends for support. But as the day passes without a trace of the lost girl, nerves fray, and accusations fly.