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.

An abused woman is feverishly sought by police in the murder of her ex-husband but is being hidden by abused woman-advocates. At the same time, Gunvald Larsson discovers a police report that his long-estranged sister has been abused. He confronts her with his knowledge but she denies it.