An elderly woman is murdered to take over her estate and that this leads to a killing sprey of those involved and a group of innocent teenagers. This film from Mario Bravo has the reputation as being the start of the slasher genre of films. Various scenes have been used as the basis of scenes in many other horror/slasher films. Whilst there are some weaknesess in the film and none of the characters are really likable, it is a significant milestone in the genre.