With images obtained during an investigation carried out in fifty eight slaughterhouses in Mexico between 2015 and 2017, «Slaughterhouse» is a documentary that takes us into the hermetic world of the meat industry. The footage shows the systematic exploitation and violence suffered by animals in slaughterhouses and that is deliberately kept hidden by the meat industry. In order to carry out this documentary, the director, who for years has been carrying out a project against animal exploitation named as «Tras los Muros», has had to use false identities that have allowed him to access all these places.