A handicapped and wealthy countess, who owns the lands of a disputed bay, is hanged by her husband and he is immediately killed. The crime scene is forged to simulate a suicide of the old woman. Later, two young couples are murdered in the bay. The inheritors of the fortune of the countess want the possession of the place and kill each other, in a bloodshed bath in the area.

“Reazione a Catena” is a gory slash movie with a different characteristic: there is no serial killer, but almost a chain reaction of murders. The deaths are motivated by the greed of different persons, and their motives are based on the interest of the civil construction in the ecological area, and the reluctance of the elder countess in selling her property. None of the character is innocent, except the two young couples that arrive in wrong the place for fun. The camera, with many closes and movements, is quite different. The black humor is very sharp; most of the deaths are very original and the conclusion is silly. The copy of the Brazilian VHS is a little dark, but it is watchable.