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.

Melvin, a British author living in America, returns home to London for Christmas to introduce his American fiancée Lisa to his eccentric British-Caribbean family. Their relationship is put to the test as she discovers the world her fiancé has left behind.

Melvin and Lisa return in this highly anticipated sequel to the 2021 romantic comedy, which is rumoured to introduce Lisa's family.