Cass and Gav's troubled marriage reaches a crisis as they journey through Serbia in search of a fresh perspective. Their adventure takes a dark twist when they encounter Saint Peter, a charismatic local eager to show them the sights. What begins as a seemingly innocent tour quickly spirals into a chilling exploration of their relationship and the dangers lurking around them. With tension mounting, the couple must navigate both the eerie landscape and their own unraveling bond, revealing unsettling truths along the way.