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.

On a cruise ship bound for the Caribbean, 42 year old Nanna has invited her daughter Cille and her best friend on a cruise to celebrate Cille’s 18th birthday. The expectations are high, and they have big plans set for the three days aboard the cruise. But on the first evening, the dream vacation descends a nightmare, and Nanna realizes that in order to get justice, she must take matters into her own hands.

In December 2004, close-knit family Maria, Henry and their three sons begin their winter vacation in Thailand. But the day after Christmas, the idyllic holiday turns into an incomprehensible nightmare when a terrifying roar rises from the depths of the sea, followed by a wall of black water that devours everything in its path. Though Maria and her family face their darkest hour, unexpected displays of kindness and courage ameliorate their terror.