Rosa's relationship with her family always left much to be desired: her mother constantly lectured her, her aunt's arrogant patronage irritated her, and her grandfather did not care about her. She would never have stayed under the same roof with them, but because of the winter weather the roads were snowy, and the girl found herself locked up with her family in her aunt’s country mansion. After New Year's Eve, Rosa realized that something strange and terrible was happening in the house... Its inhabitants stopped sleeping completely, discovered that there was no one left in the village except them, and the full moon inexplicably dragged on. All their attempts to get out into the city failed, and a figure in a black hood began to appear outside the windows every night...