A huge monster with the head of a serpent and the body of a crocodile is rumoured to lurk at the bottom of a lake in Western Ukraine. The monster has been frightening residents of a nearby village for more than one hundred years. Now and again the gruesome creature comes ashore and attacks domestic animals. At times it harms humans too. As a rule, locals steer clear of the lake. Researchers keep gathering information in an attempt to unravel the lake mystery.