Dr. Julian Olcott, a science teacher with a mysterious past, arrives for his new job in an institutional boarding school for female troublemakers. That night, intern Mary Smith, who is blackmailing another teacher, Sir Alfred Whiteman, with some love letters, is slaughtered. The detective in charge of the investigation attributes the crime to a animal, while her mate Priscilla believes that Sir Alfred killed her. Over the next few days, other deaths happen at the school, reducing the list of suspects.—Claudio Carvalho, Rio de Janeiro, Brazil