There have long been rumors at the New York Museum of Natural History about a terrible Museum Beast living in the abandoned basements of the huge building. And these rumors turned into a terrible reality: two children were brutally murdered in the museum, and then the mutilated body of a guard was found. The investigation of these crimes, striking in their cruelty, is entrusted to police lieutenant Vincent d'Agosta, who initially suspects that a maniac is operating in the museum. This version is supported by FBI Special Agent Aloysius Pendergast, who investigated a series of similar murders in another state. However, gradually a terrible truth is revealed to them: the Museum Beast exists, and it continues to kill...