After researching a 15th century serial killer, a young woman uses her expertise to outwit a modern-day monster that is driven by the same desire for blood.

Lubos, an Alpine rescue worker, surprises his delighted daughter Amálka with an early return to Prague. Her joy leads her to skip school, prompting Lubos to join her class on a Tatra mountains trip. Amidst family chaos and comedic mishaps, their reunion hangs in the balance.