In Guatemala, violence is contagious. The neighbors of Villas de La Esperanza, in fear of an eventual invasion of those infected by violence, arm themselves and patrol nights, risking their lives for the safety of their families. But battling violence with violence only spreads the contagion, and the neighbors will realise that the greatest danger is not what lurks outside their secure gated community. The real danger lies within. In Guatemala violence is contagious, and we are all infected.

There's a violent secret under the surface in Guatemala City. It affects families in every social class and in every neighborhood. Everyone knows it but everyone is silent. That's when Vicente decided to speak up. Based on the true story behind a landmark legal case, "Aullido" (Howl) displays what can happen when children are bold in the face of injustice and how those in power can stand on their behalf.

It tells the story of Marta and Teresa, who will face each other in the "Tamalon Navideño" contest, to find out who prepares the best tamal. To win the award, they will put their friendship of years to the test.