Veronika and Mirek try to revive their relationship with a horror-themed Valentine’s trip to the Slavkov Forest, known as the “Knot of Evil.” The tour group includes anxious guide Alex; Ludmila, a detective novel fan sent by her kids; Honza, an extroverted gay journalist seeking a big story; and David and Dana, a married couple who reflect what Veronika and Mirek fear becoming. The bus visits historic massacre sites that seem unimpressive at first, but after Veronika discovers a strange doll, eerie changes unfold. Tensions rise as the travelers’ darker sides emerge—fear, aggression, and suspicion lead to growing hostility. A haunting cry echoes through the woods, suggesting the presence of a mythical being tied to the Slavic legend of the Navka, a spirit from the realm of the dead.